> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Karen
> Nakamura
> Sent: Sunday, November 19, 2000 8:55 PM
> To: [EMAIL PROTECTED]
> Subject: Re: EOS Why doesn't my 1.4 50mm or my 2.8 70-200L....
>
>
> I think what is going on is that the focusing screen is smaller than the
> actual 35mm film. The image gets projected on a smaller focusing screen,
> then flipped and enlarged in the pentaprism. Because the focusing
> screen is
> smaller, the circle of confusion is much smaller, which means
> that the DOF
> appears to be less.
Actually, by definition the focusing screen is exactly the same size as the
film image. As I mentioned in a previous message, I think it's a matter of
the "graininess" of the focusing screen combined with a low-magnification
viewfinder.
If we could easily tell whether an image is in focus on the groundglass,
manual-focus cameras wouldn't need split-image or microprism focusing aids.
Chuck Skinner
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