New answers tagged viewfinder
It does depend on a number of factors such as the model of camera and the length of exposure but generally speaking it is neccessaty .
By "internal automatic eyepiece cover" I assume you mean something to block the light instead of something to protect the eyepiece glass from scratches. There are no cameras with an "Automatic Eyepiece Cover" but some Pro level cameras have a manual eyepiece shutter to block off light during long exposures when your eye is not covering the viewfinder. ...
Because it would add expense and complexity, and most consumers don't request it.
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