Stupid lens question  Started Nov 6, 2012 | Discussions thread
Forum ProPosts: 12,400 Re: Stupid lens question In reply to
Signalz1123, Nov 6, 2012  Signalz1123 wrote:  So I have a stupid
lens question I've always wondered about.  Why is it that when
you hold a lens up to your naked eye and look through it,
objects appear out of focus, even when your eye is exactly where
the sensor would be. ... For the distant objects to become
clear, i have to hold the lens over a foot away from my eye.Why
will the lens focus distant images for a sensor but not for an
eye the exact same distance away?  OK, imagine that instead of
putting the lens on a camera and having it focus on the sensor,
you have a little piece of ground glass that you hold up behind
the lens that the lens projects a focused image onto.  That
ground glass image is like any other object you want to look at
- a newspaper clipping or a stamp or a coin.  Can your eye focus
on something that's practically touching your eyeball ?  -
Dennis  -- hide signature