Why are eyecups needed?
What IS the point of an eyecup on a camera?
When I bought my Nikon d5000, I got two eyecups.
One that was already attached to the camera, a rubber one. And the other one was plastic.
The small eyecup thing on this picture:
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What's the point of different eyecups?
What appears in the picture-the contents of the standard D5000 kit-is not an eye cup, but an eye cap. The eye cap is a windowless black plastic cover that replaces the rubber eye cup on the body. The purpose of the eye cap is to prevent light from seeping into the mirror box through the viewfinder window. Stray light has the ability to effect metering and can possibly affect the contrast of your pictures if it's strong enough. This is especially important when you're shooting off-camera (i.e. remote, tether, self timer, intervalometer, etc. shooting). Alternatively, it can be useful in protecting the viewfinder window in storage.
Aftermarket eye cups do exist and they come in different shapes and sizes. It's all a matter of comfort and utility. Some are better at bridging the eye to the viewfinder than others. There are also eye cup with magnifiers or diopters too, though these can fit into their own individual categories.
The attached eyecup prevents light coming from the sides of the viewfinder that may affect exposure. The separate piece is a viewfinder cover to avoid light entering through the viewfinder in cases when the photographer is not looking through the viewfinder. The most common case is when the self timer is used and the photographer joins the rest of the people in front of the camera.
Answer by keerok on 10 Jan 2010 05:10:28
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