On Sat, 18 Nov 2000 17:44:07 +0100, Gerry Morgan <[EMAIL PROTECTED]>
wrote:
>Greg Lynch wrote:
>>I've never ever on ANY camera
>>had the viewfinder show me what's in and out of focus without using DOF
>>Preview. Unless the whole image is out of focus. Part of the viewfinder
>>image in focus, and the rest out of focus (like when the autofocus fails)
>>is something totally foreign to me. What am I missing????
>
>To slightly restate Paul's original observation, he was saying that at the
>*widest possible aperture* for a given lens (for example, f/1.4 on the 50mm
>f/1.4 lens), there should be no need to depress the DOF preview button to
>see what would or would not be in focus at that aperture setting. This is
>because the DOF preview button works by stopping down the lens to the
>desired aperture, but, if the lens will be used wide open, there is no
>stopping down to be done.
Correct.
>Paul was puzzled (correct me if I'm wrong, Paul), by his observation that
>everything in his viewfinder is in focus, even though the lens is wide open
>(DOF button not depressed). Yet, if he were to take the photo at the
>wide-open aperture, parts of the photo would be out of focus. If Paul's
>observation is correct, something strange must be happening.
Correct again. I have done some more focused observations based on the
comments posted here and indeed I have discovered that the field is
not in focus as much as I had thought it was (strange how my
perception based on informal use was different than when I really
focused (pardon the pun) on the issue). But I still maintain that the
DOF you see in the viewfinder during normal focusing is greater than
what you see in a final print if you shoot wide open. I'm puzzled as
to why this is, but I appreciate everyone's comments. There is no
reason this should be camera or lens specific is there?
--
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