Showing posts with label Technique. Show all posts
Showing posts with label Technique. Show all posts

Sunday, December 5, 2010

Why you want the lens hood on all the time

Most lenses are shipped with a dedicated hood. Its purpose is to diminish lens flare. Lens flare is caused by light rays hitting the lens elements diagonally. As a result, the shape of these elements appears in the final image. Sometimes lens flare is no so obvious; you may not see such shapes into the image, but you get a low contrast image. Because of their design, ultra wide angle lenses are prone to lens flare more than other lenses. It’s very difficult (almost impossible) to shoot into the sun with a wide angle lens and not to get lens flare. Sometimes you can use this “effect” creatively (in fact, Photoshop has a filter to add lens flare in post-processing), but most of the time you want to avoid it.
So what you can do to avoid lens flare?
1. Keep the lens hood on all the time, even in situations where no intense light is present. I see many photographers taking pictures with the lens hood reversed in storage position. I can’t believe you are so lazy to do so. It’s the best thing you can to do to decrease the contrast of your images! The only time when you want to remove the lens hood is when you are going to use your camera’s pop-up flash. Pop-up flashes are located just above the lens, so when they fire the lens hood causes a shade that is present in the final image.
2. If lens hood is not enough you can further up use your hands, cap or whatever you have available to block light rays from reaching the lens diagonally.
3. Avoid shooting directly into the sun/ light source or at near angles, especially if you are using a wide angle lens.
     

Friday, November 12, 2010

Photographing Kids (capturing the moment)



Kids are innocent and deliver genuine expressions, but that comes with a cost; they won’t pose or stand still for long periods of time as they get bored quickly. It’s important to have in mind that kids love to play, and try to make the photoshoot look as pleasant as possible. Here are some tips:
1. Make you settings before you place kids in the scene: e.g. use a gray card to meter, or some other person, decide about the aperture, speed, ISO and filters you are going to use, etc. Don’t get the kids involve at this stage, because until you are finished with your settings, they will get bored.
2. Give them time: Don’t rush things out. Kids need their time; they eat frequently and sleep more frequently (!), but when they finish their nap they wake up with very good mood and energy.
3. Make photoshoot a game: give them candies (ask parents’ permission), play with them, ask them silly questions, have toys with you that make stupid sounds and make them laugh.
4. Use a wide aperture & focus on the eyes: A common practice when shooting portraits is to use a wide aperture to throw the disturbing background out of focus. You can use an extreme aperture like f1.4, which will throw everything except the focus point out of focus, but as long as you keep the eyes sharp, you have a winner. Always focus on the eyes; you have to have a very good excuse for not to. It’s also a good practice to use a telephoto lens which compresses facial characteristics and gives a flattering look to the portraits.    
5. Choose a neutral picture control: Don’t use vivid or any other picture control setting that delivers high contrast and saturated colors; skin tones have to look natural.
6. Capture the moment: At the end of the day the photos that will stand out will be the ones that manage to capture the moment (an innocent expression, a true laugh, love). Be ready for them when they show up, because they will; don’t spend time looking at the LCD screen at the back side of your camera; instead look at the action while happening. As a professional photographer you were hired to get these moments, not for taking snapshots.
7. Post-processing: When shooting in RAW you have great control in post-processing, while maintaining the highest image quality. Fix any white-balance and color issues, smooth skin tones and remove any unpleasant blemishes, apply sharpening to the eyes, but be careful so that your images don’t look unnatural; you don’t want skin to look like plastic and the eyes look glassy. Also try converting some of the images to black & white (Don’t just use the default settings, as they will result in a gray image. Black & white images that catch the eye have strong contrast and “extreme” blacks and highlights). Be aware that not all images are suitable for black & white, but when it works, it gives a documentary feeling.

Tuesday, November 2, 2010

Using White Balance creatively

On the article Great Color starts from WB I talked about the things you can do to get a correct WB. But sometimes “correct” is subjective and WB is a subject of personal taste and creativity. Sometimes we want to achieve a totally correct WB, so that colors are reproduced accurately. Some other times we may want our pictures to have a “wrong” WB, in order to communicate a certain feeling.

The image above is a composition of 2 copies of the same image with different WB settings applied to each of them; a custom WB was applied in ACR to bring out the soft saturated qualities of the blue sea and sky, but this caused a blue cast on the white surface of the boat. The problem is, although our eyes don’t perceive the sea and sky as problematic, they do with certain colors such as white, which is a well-known color. In other words, white has to be white, if it doesn’t, something is going wrong. So I made a second copy of the image and applied a “correct” WB. Then I opened both copies in Photoshop and composite so that the white surface of the boat is the copy with the “correct” WB and the rest of the image is the copy with the custom WB. The result is a more creative approach to a rather ordinary image.     

Monday, November 1, 2010

Shooting food & sweets

Here are some small tips for shooting food & sweets:
1.            Shoot from a low angle: by shooting from above it makes your images look like snapshots. 
2.            Use a macro lens which reveals detail and texture and allows for small working distances (the above shots were taken with a Nikkor 105mm 2.8 macro lens, except the image of the hotel hall which was taken with a Nikkor 14-24mm 2.8 wide-angle lens). 
3.            Overexpose by 2/3 or even a full stop, according to the subject. As a result, your subjects will look fresh and delicious. 
4.            Use a swallow depth-of-field. Your images will look more pleasing and professional, but please note that if you are using a macro lens you have to close down (to f8 or f11) in order to get a sufficient depth-of-field. If you are working handheld and using a wide aperture (e.g. 2.8) it’s very easy to get out-of-focus images. 
5.            Use directional light with off-camera flashes, softboxes/ umbrellas and reflectors. If you have to use on-camera flash, point its head to the ceiling (The above shots were taken at a recent wedding. I didn’t have the opportunity and time to use off-camera flash, so I used an on-camera SB900). 
6.            In post-processing, use strong contrast, to make colors come to life.

Wednesday, September 8, 2010

Exposure Metering


This article is the last one in a series of articles covering the subject of photographic exposure.
If you haven’t read Elements of Photographic Exposure and Exposure Modes, it’s a good time to do so now before moving on. In the above articles we talked about the factors that form the exposure (aperture, shutter speed, ISO) and the camera’s exposure modes (the programs that allow the photographer to take exposure control; Program Priority, Aperture Priority, Shutter Priority and Manual Priority). So, in order to keep things simple, lets summarize all the above. Depending on the scene you are photographing and your artistic vision, you choose an exposure mode:
·           Program Priority if you are in a harry: You let the camera set aperture and shutter speed based on what it things is best. You control the ISO.
·           Aperture Priority if depth-of-filed is important: You set the aperture and ISO and the camera sets the shutter speed.  
·           Shutter Priority if motion is important: you set shutter speed and ISO and the camera sets aperture.
·           Manual Priority: you have total control over the exposure by setting aperture, shutter speed and ISO.

As you might though so far, a piece of information is missing from the above decision workflow; how does your camera, or you, decide which the appropriate exposure is? Well, modern cameras have a build-in exposure meter which evaluates the scene and provide you (and your camera) with information about exposure.

The problem
Modern cameras have come a long way and they are becoming cleverer as time passes by, but still they are not perfect. There are some “tricky” situations that can fool your camera’s exposure meter. Even worsted, your camera can’t make artistic decisions. So how do cameras determine which exposure is right and which exposure is wrong? Well here’s the trick: your camera makes the assumption that the world is middle gray! (if you like the more technical term, middle gray is a subject with 18% reflectance). Please note: we are not talking about the actual color gray here, but the reflectance (tonality) of the subject.  
Middle gray looks like this:
 
The problem is that not all subjects have an average reflectance. Some subjects are either darker or brighter than average:
So let’s say you are photographing a black subject (e.g. a black jaguar – it happens all the time right? !) - . If you let your camera make the exposure decision, it will overexpose your black jaguar and turn it into a gray jaguar. Or, you are photographing a white subject (e.g. snow). Your camera will underexpose the snow and turn it into gray. 
So, what did the manufacturers were thinking when developing those meters? Well, as with most situations in life, you have to start with an assumption and build on that. On the other hand, if you sum the reflectance of an average scene, you come up with a mean that is middle gray.

Metering Methods
Nikon cameras have 3 metering methods for determining exposure:
·           Spot metering: it targets 1,5% of the frame, where your focus point resigns.
·           Center-weighted metering: it measures the entire frame but emphasizes on the middle area of the frame (exposure decisions are based 75% on the central area and 25% on the outer area).
·           Matrix metering: It measures the entire frame. This method is becoming more complex as the technology moves forward. Older camera models were measuring the entire frame and gave a little emphasis on the area that is behind the selected focus point. Modern camera bodies take into account a lot more factors; lens focus distance, highlights, skin tones, color, etc and compare the scene with an image database in order to make their exposure decision. Newer camera models are cleverer than old ones and have a tendency to do the right thing. However, they are not 100% accurate yet.

What to do (the easy method)   
If you are photographing a subject and you do not agree with your cameras’ exposure decisions, you can use exposure compensation to override your cameras’ decision. Use “-“ if your subject is darker than average, use “+” if your subject is brighter than average.

What to do (the accurate method)
1.            Set your camera to Manual Priority Mode and to Spot Metering Method.
2.            Set your ISO accordingly, depending on the situation and your lens aperture (if depth-of-field is     important), or shutter speed (if motion is important).
3.            Point your active focus point on a subject:
(a)          If the subject is middle gray, zero out the harsh mark of the metering bar (by adjusting accordingly ISO, Aperture or Shutter Speed):
 (b)         If the subject is completely white, put the harsh mark of the metering bar to +2 (e.g. if you are photographing a wedding, you can set the bride’s wedding dress to +2) .
(c)           If the subject is completely black, put the harsh mark of the metering bar to -2 (e.g. if you are photographing a wedding and the groom is a wearing a black suit, you should set the back suit to -1,5 in order to retain detail).
Note: Blue skies, light green and red in nature have an average reflectance. Yellow color is +1 stop, while brown and dark blue colors are -1 stop. Caucasian tone skin is +1 stop, while darker skin tones may fall under average reflectance.    
Tip: A good practice is to start using a dedicated gray card in the scenes you are photographing. Zero out the harsh mark of the metering bar on the card and then observe where the other tones in the scene fell. In no time you will gain a lot of experience and the card will no longer be useful to you!   


Monday, September 6, 2010

HDR – part1


The problem with today’s digital sensors
Digital photography has gone a long way in the last decade. Today’s digital cameras offer amazing capabilities and exceptional image quality that it was difficult to even imagine a few years ago. Digital has change everything; darkrooms have become “Lightrooms”, film has become 64 GB flash disks (take as much shots as you want; it’s free!), new and intelligent matrix metering systems, extraordinary ISO capabilities (at a rotate of a wheel, not by changing films all the time), new lenses with CPU, 10 fps, digital printing (a lap at home), etc, the list is endless. However, there is one major problem; the restricted dynamic range (or latitude).   The problem is due to the linear nature of sensors, meaning that digital has no tolerance to metering mistakes; highlights are blown very easily. A modern DSLR has about 10 – 11 stops of dynamic range at the base ISO (the range is being decreasing as ISO values are becoming higher), meaning that the sensor is able to record 10-11 stops of image data from dark to bright values:
  
 e.g. in the following image, we have pixels that are either completely dark or completely white (no detail). The histogram shows the distribution of these tones:
  
If we try to photograph a scene with a greatest dynamic range (contrast) than our camera’s dynamic range, the results are rather disappointing:

(a)          If we meter for the highlights (sky), darker subjects (tree, ground) get underexposed.
(b)          If we meter for the darker subjects, brighter subjects get blow out.
(C)          If we take a an overall reading, we end up with compromise results.

“Traditional” Solutions
1.            Use light (flash, reflectors, softboxes) to illuminate darker subjects.
2.            Use filters (ND graduate, polarizer) to darken the highlights.
3.            Use Fill light & Recovery (camera raw) and Selective Adjustments in Photoshop, to darken the highlights and brighten the dark tones.
4.            Use Dodging & Burning in Photoshop, to darken the highlights and brighten the dark tones.
5.            Use Exposure Blending in Photoshop (blend different exposures in separate layers and selectively erase certain areas).
6.            Contrast Masking in Photoshop.
7.            New Technologies, like Nikon D-lightening.
8.            You can photograph during the “blue hour” of the day, where the sky and the ground have the same amount of brightness.
! Use the above methods with caution, as they may result in contrast loss!

Coming next: the HDR methodology.
  


Tuesday, August 24, 2010

Basic Lighting Setup
















Here is a basic lighting setup for outdoors portraiture images:
1.            Set your camera to Manual Mode and underexpose the background for about 1 
                stop
2.            Use the sun as a backlight (if there is no sun available, place a speedlight on a tripod and point it on the subject’s hair)  
3.            Set up a speedlight in a softbox (for smooth lighting) and place it at 45 degrees angle high and above from your subject (if you don’t have a softbox you can use an umbrella or a diffuser)
4.            Control your speedlight(s) via the pop-up flash of your camera (if you don’t have a pop-up flash you can use the SU800 IR transmitter, another speedlight, pocket wizards, or cords)   
The above image was taken to a local park by using the sun, an SB900 attached on a softbox and an SU800 on a D3s.

Monday, August 2, 2010

Great color starts from WB


I don’t think I  have to ask if you have ever shot an image that looks yellowish, bluish or reddish. It happens to all of us and it’s due to incorrect white-balance (WB) settings. You see, your cameras’ “Auto White Balance” fails in some situations (in fact it fails in most situations!). As a result, colors are incorrect. So what you can do to dial with this issue? Well you have 3 options:
1.            Select a WB preset on your camera: e.g. if you are shooting indoors under a tungsten lamp, set your WB for tungsten, if you are shooting outdoors in a cloudy day, set your WB for cloudy. The problem is that not all situations you are photographing are the same; not all tungsten lamps are the same, not all cloudy days are the same.    
2.            Set a Custom WB on your camera: set your camera for custom WB and fill the frame with a middle gray or white object (you can use a dedicated middle gray card, such as Lastolite for that purpose). Take the shot and you’ll have an accurate WB. Just make sure to expose the card to the same lighting conditions as the subject you are photographing. If the lighting conditions change, you have to repeat that procedure.  
3.            One of the greatest benefits when shooting in RAW mode, it’s the ability to adjust white-balance (WB) settings in post-processing, without affecting image quality. If you are shooting JPEG, WB settings are embedded in the image and can’t be altered.  Adjusting WB in Adobe Lightroom couldn’t be easier:
(a)          Import the RAW files in Lightroom.
(b)          Go to “Develop Module”:
(c)           Click on the “Basic” Tab:
Here you have several options; you can select a WB preset:
you can use the Temp and Tint sliders to manually adjust WB:
or you can use the WB selector tool to click on an area of the image that is either middle gray or white:

WB tips
·           Avoid using “Auto White Balance” since the results are not consistent. Instead, get used to set a Custom WB on camera. If you don’t have time to do so, set your camera to “Auto White Balance” and take an image with the gray card included in the frame. In that way you will be able to correct WB very easily in Lightroom by using the "WB selector tool".

·           Perfectly correct WB may not be what you wish; e.g. when shooting portraits, you may want to have a warmer look. That’s easy; create a correct WB and then move the “Temp slider” in Lightroom slightly to the right to achieve that warmer look.

Monday, July 12, 2010

Understanding Depth-of-Field (DOF)


What is it?
DOF is the portion of the image that is in sharp focus.  

What are the factors that influence DOF?
1.            Sensor’s size (all else equal, the smaller the sensor’s size, the greater the DOF). e.g. point-and-shoot cameras tend to produce images with greater DOF than DX DSLRs (D3000, D5000, D90, D300s), while DX DSLRs produce images with greater DOF than FX DSLRs (D700, D3s, D3x).
2.            Aperture (all else equal, the smaller the aperture, the greater the DOF).
3.            Focal length (all else equal, the smaller the focal length, the greater the DOF) e.g. a wide-angle24mm lens tends to produce images with greater DOF than a telephoto 200mm lens.
4.            Focusing distance (all else equal, the greater the focusing distance, the greater the DOF).

How to use it
By controlling DOF we can add interest and creativity to our photos.
Portraits: Usually when shooting portraits we want to achieve small DOF in order to isolate our subject from the background:
·           Use a wide aperture (e.g. f2.8, or even f1.4).
·           Use the biggest focal length possible (e.g. 200mm is better that 18mm).
·           Get as close as possible to your subject.

Landscapes: Usually when shooting landscapes we want to achieve the opposite; great DOF so that almost everything is in focus:
·           Use a small aperture (e.g. f11, or even f22).
·           Use the smallest focal length possible (e.g. 18mm is better that 200mm).
·           Get as far as possible from your subject.
(! Note: the above guidelines concern things you can do in order to achieve the desired DOF. Composition rules, depending on the situation, may instruct something else!)   

Extra tips
·           DOF in not equally “distributed” between the foreground and the background of your subject. In fact there is a ratio of 2:1 between foreground and background DOF. In other words, DOF is twice as much in front of the subject you are focusing at, than it is behind the subject. If you are shooting landscapes with big DOF, focus your lens at the 1/3th of the distance covered by the frame.
·           When using shallow DOF to isolate a number of similar subjects from the background, sometimes you are wondering on which subject you should focus your lens. Rule of thumb states that you should focus on the nearest subject. You should have a very good reason to violate this rule!
·           Glossary: you may have heart the term “bokeh”. It’s the area of the image that is out of sharp focus, created by using small DOF. Good lenses tend to produce sweet bokeh.          

Practicing
Your living room is a good place to start practicing DOF. Take 2 objects and place them on a table so that they cover different distances from your lens. Try to isolate the front subject from the background subject (set your camera to Aperture Priority Mode, use your lens’ wider aperture, if it’s a zoom lens, use the biggest focal length and get as close as possible to your subject). You see it’s very easy! Then try various scenarios; change the distance between the objects, change your lens distance from your main subject, change your focal length, aperture and composition. Try to alter one variable at a time in order to see how each variable affects the final image. In one hour time you’ll be using DOF like a pro! Then get out there and do some landscape photography. Set your camera on a tripod and take some shots by altering aperture, lenses, focusing distance and composition. Review the results and see what works best in certain situations. Experimentation has always been part of photography, not just for practicing, but to make unique pictures as well. Have fun!  

Sunday, July 11, 2010

Shooting Beautiful Sunsets


A friend of mine is going to Santorini in a few days time and he asked for an advice on how to shoot great sunsets. It is said that Santorini has the most beautiful sunset of the world. I haven’t been to all over the world, but I’ve been to Santorini and I can say that is absolutely beautiful. In fact, that trip was the reason I started photography; I bought a point-and-shoot camera from the island and started taking pictures. Colors were amazing, the volcano rocks getting into the sea had a wild beauty on them and the small white houses built into the rocks were magical. By the time I came back home, I bought my first DSLR (a Nikon D80) and subscribed to a local photographic community. If you haven’t been to Santorini, I advise you to do so and take some beautiful images!
Well back to our subject. We see beautiful images of sunsets everywhere; in magazines, travel guides, on the internet. In fact we believe that if we’ve been there these amazing sunset colors will be captured by our eyes. Well that’s not true. These dramatic colors can be captured only by the sensor! You see sometimes life is more beautiful through the viewfinder than it is in reality, but that’s why you are dealing with the subject of photography, isn’t it?! It is our job, as photographers, to see the ordinary and capture it as extraordinary…
Shootting stunning sunsets couldn’t be easier! Just follow these steps:
1.            Start with the lowest possible ISO value for best image quality.
2.            Set your camera to Manual Mode and Spot Metering.
3.            Set a small aperture (e.g. f11, f16) for great depth-of-field.
4.            Point the focus-point at a spot near the sun and adjust the shutter speed to zero out the hash mark of the exposure bar displayed in the viewfinder (sunset colors are usually midtones), as shown below:



5.            Check your shutter speed. If you are not on a steady tripod and the shutter speed is not fast enough to get a sharp image by handholding the camera, increase the ISO or open aperture, until you get a fast enough shutter speed (but be aware that sunset skies are prone to digital noise).
6.            Reframe and take the shot! That’s it!

Extra tips
-              If you want richer colors you may underexpose intentionally and set your exposure to -0,5 or even -1,0, depending on the situation.
-              Sunset light (and colors) change very rapidly as the sun moves towards the horizon, so every now and then you have to check your exposure settings by repeating steps 1 – 6.
-              Don’t just photograph the sun in the sky; compose your frame with a subject in the foreground to add interest to your shots. With the procedure described above, your foreground subjects will be displayed as silhouettes (because their reflectance is much lower that the reflectance of the sky). This is an interesting effect, but if this not what you wish, you can avoid it (if you are not far away from your subject and if your subject is not very big) by using flash (off-camera flash works best, but if you don’t have an external flash unit don’t hesitate to use your camera’s build-in flash). Set your flash to iTTL. Start with a flash compensation of -1,7 and adjust accordingly (remember you don’t want to use much light; just a small amount as a fill-light).  

Have fun! You don’t have to be in Santorini; beautiful sunsets happen everywhere (except from your living room) so get out there and create some stunning sunset images!    

   

Saturday, July 10, 2010

Exposure Modes (Moving beyond Auto; it sucks!)



If you haven’t read Elements of Photographic Exposure it’s a good time to do so now, before moving on! In this tutorial we are going to talk about how you apply this knowledge in practice.   
Every DSLR has several exposure modes, which control the way the camera makes exposure decisions (the combination of aperture, shutter speed and ISO). Many consumer DSLRs have a number of auto exposure modes, eg. Auto, Portrait, Landscape, Night Landscape, Sport, Beach, etc). These modes contain settings loaded in the factory and they promise to make things just work, even if the user doesn’t understand basic photographic concepts (that’s why they are also included in point-and-shoot cameras). So what are the disadvantages of these modes?
-              They are automatic modes, so they don’t allow the user to take exposure (and thus creative) control (e.g. in Auto mode, if the camera perceives that the light of the scene is too low, it will pop-up the build-in flash in order to illuminate the scene. It’s ok if this is what you want, but it’s a big problem if this is not what you want).
-              They are programmed according to average situations, but not all situations (scenes) you are photographing are average (not all portraits are the same, not all landscapes are the same, etc).
-              The settings being applied by these modes are quite hidden and the user doesn’t know exactly what the camera is doing, thus it’s difficult to master these modes.

Pro DSLRs have only 4 exposure modes that give the photographer total control over the exposure:   
- P (Program Priority)
- A (Aperture Priority)
- S (Shutter Priority)
- M (Manual)

P (Program Priority): Camera sets aperture and shutter speed. You control ISO, focus point and flash, but you can also alter camera’s decisions and set aperture or shutter speed (this mode is like Auto, but allows you greater control).
A (Aperture Priority): This is the most famous exposure mode; the one that serious amateurs and pros use most of the time. It allows you to set aperture and camera sets shutter speed accordingly (based on the aperture and ISO set). It’s the mode to use when depth of field is important.
S (Shutter Priority): You set the shutter speed and camera sets aperture accordingly (based on the shutter speed and ISO set). It’s the mode to use when shutter speed is important (if you want to freeze motion you set high shutter speeds, if you want to blur motion you set slow shutter speeds).
M (Manual): This is the mode that gives you full control over exposure. You set both aperture and shutter speed, but manual mode doesn’t throw you in the middle of the ocean and tells you “swim to get out”! It gives you “clues” on which you can rely to set the appropriate exposure (when Manual mode is selected, the viewfinder displays a bar that looks like this:
  

The middle line represents 18% middle gray reflectance. Everything above or beyond are perceived by the camera’s meter as over or under exposed. This is the true power of Manual mode; it allows you to set exposure in the way you wish, not the camera!
Strictly speaking, all exposure modes, except Manual, are automatic modes, in a sense that the camera takes control over exposure. e.g. when using Aperture Priority, you set the lens aperture in order to control depth of field, but the camera sets shutter speed assuming that the scene has an average gray reflectance. Of course you can alter the shutter speed set by the camera, by using exposure compensation.  

Putting them to work in practice!
In practice things are very simple!
1.            You are photographing a scene where depth of field is important. Set you are ISO according to available light (start when the lowest possible value for best image quality). Set Aperture Priority and specify an aperture (if photographing a portrait use a wide aperture, e.g. f4, or even 2,8 or 1,4, in order to isolate your subject from the background. If shooting a landscape, use a smaller depth of field, e.g. f11 or f16, In order to get everything in focus). Check the shutter speed set by the camera. If you are not on a steady tripod and the shutter speed is not fast enough to get a sharp image by handholding the camera, increase the ISO until you get a fast enough shutter speed. Note: if you are photographing a black or white subject, the exposure most probably is going to be wrong. Use exposure compensation to override the camera’s meter; -1,5 or -2 for black subjects, +1,5 or +2 for white subjects).
2.            You are photographing a scene where motion is important. Set you are ISO according to available light (start when the lowest possible value for best image quality). Set Shutter Priority and specify a shutter speed (if you want to freeze motion, set a high shutter speed, if you want to blur motion, set a slow shutter speed. How much is high and how much is slow depends on the moving speed of your subject. On average, 1/60 blurs rain, 1/8 blurs people walking, 1/250 freezes sports, 1/1000 freezes a bullet). Check the aperture set by the camera. If the camera needs a wider opening that the lens’ widest aperture, in order to expose the scene correctly, it will display Low; in that case set a higher ISO. If the camera uses the smaller available aperture and still the quantity of light coming in the sensor is high, it will display High; In that case you have to lower ISO or/and use a faster shutter speed. Note: if you are photographing a black or white subject, the exposure most probably is going to be wrong. Use exposure compensation to override the camera’s meter; -1,5 or -2 for black subjects, +1,5 or +2 for white subjects. 
3.            You don’t have the time to make exposure decisions (e.g. street or wedding photography). Set your  ISO according to available light (start when the lowest possible value for best image quality). Set Program Priority and start shooting. You can bypass camera’s decisions (choose a different aperture or/and shutter speed) by rotating the camera’s front and rear command dials. Note: if you are photographing a black or white subject, the exposure most probably is going to be wrong. Use exposure compensation to override the camera’s meter; -1,5 or -2 for black subjects, +1,5 or +2 for white subjects.
4.            You want best exposure control  and you have the time to do so (you don’t need much time, trust me!) Set you are ISO according to available light (start when the lowest possible value for best image quality). Set Manual mode and adjust aperture and shutter speed according to your appetite and by taking notice of the exposure bar in the viewfinder display. If the subject you are shooting is black, set the exposure to -1,5 or -2 on the bar scale. If the subject is white, set the exposure to +1,5 or +2.

Practice
Once you apply exposure modes in practice, you will soon realize how easy is to master them! If you used to shoot in Auto mode, start shooting with Program mode. It has much more fun to select the focus point you wish and not to have the build-in flash pop in the way.
As soon as you feel comfortable, move to aperture priority. It takes some practice, but in a few days time will start shooting like a pro! (just watch out of your shutter speed).
Once you get yourself familiar with Aperture Priority, move on and have some fun with Shutter Priority. You have unlimited creative choices when experimenting with motion.   
For ultimate control, move on and start practicing in Manual mode. There is only one boss here and that is you!
There is no right or wrong exposure; only creative exposure choices. Explore your passion and yourself. One of the main things that distinguish amateurs from pros is exposure handling. Don’t make average images; make stunning images!