Blurry photos are usually the result of camera shake. The simplest way to remedy this problem is to buy and use a good, sturdy tripod. If you can't shoot with a tripod, remember to use a faster ISO on digital cameras or faster film on film cameras. This allows you to increase your shutter speed. The faster the shutter speed, the less likely you are to suffer from camera shake. A rule of thumb for handholding is to use a shutter speed that is 1/lens focal length or faster. In other words, if you're shooting a 200mm lens, you need 1/200th second or faster. Don't forget to compensate if you shoot digitally. If you use a 200mm lens on a Nikon D100, it is the equivalent focal length of 300mm, so you will need to shoot at 1/ 300th of a second if you want to handhold.
UNDEREXPOSED PICTURES :
Underexposure often results from letting the camera make all the exposure decisions. Remember, the camera's meter wants everything to be medium (or gray.) If you do use the auto exposure functions, one common mistake comes from using auto exposure compensation and then forgetting you've done so. Make sure that you get enough light into the scene before you press the shutter.
OVEREXPOSED PICTURES:
Like underexposure, overexposure can result from letting your camera make all the decisions. With slide film, overexposure means blown out highlights and that means lost information. Basing your exposure on shaded or dark areas and letting the camera set the exposure is a formula for overexposed slides. Look for something medium to meter from or, better yet, meter the highlights.
RED EYE:
This is a common problem resulting from on-camera flash. Move your flash off- axis. Use a flash bracket and connecting cord. You can also bounce the flash off a ceiling or wall. You can also use remote flash triggers to fire a flash that is mounted on a stand or anywhere else, as long as it is not on camera.
LENSE FLARE:
Flare occurs when direct light hits the front element of the lens and light starts bouncing around inside the lens. This causes the light to reflect off all the elements. This can reduce contrast and make your pictures look "hazy". Most commonly, it results in a series of round highlights across your image. Be sure to use a lens hood to help prevent this. Sometimes you'll need more than a lens hood. Try using your hand or a hat to shade the lens. If someone is with you, ask him or her to stand so that they cast a shadow on the lens.
Sometimes it's hard to detect lens flare when looking through the viewfinder; using your depth of field preview button will make this easier.
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