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The question is clear and I am not sure how to further explain it. Why don't cameras have internal automatic eyepiece covers?

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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. This prevents exposure errors due to light entering the viewfinder.

Canon EOS-1Dx

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Canon A-1 enter image description here

Other Cameras use a rubber piece that snaps onto the viewfinder to block the light.

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  • All good info, but doesn't really address the question, which is why an automatic cover doesn't exist.
    – Caleb
    Jul 23, 2015 at 16:45
  • What is your idea of an " internal automatic eyepiece cover" ? Is it a simple user activated eyepiece shutter like some cameras already have? Or is it a fully automatic device that activates anytime you remove your eye from the viewfinder?
    – Mike Sowsun
    Jul 23, 2015 at 22:58
  • It's not really automatic if the user has to activate it. I expect OP means a cover that moves into position when the shutter is released.
    – Caleb
    Jul 24, 2015 at 15:35
  • Thanks Mike, I've accepted your answer because it shows they existed. I meant something like the Canon A-1 above. or something which activates automatically when face/eye is not close to the eyepiece. there are sensors for turning off the display when face is close, why not this?
    – Omne
    Jul 30, 2015 at 13:12
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Because it would add expense and complexity, and most consumers don't request it.

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