Re: EOS EF 20-35 with extension tubes

[Jim Davis]

----- Original Message -----
From: M.J.Shupe <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, February 26, 2001 2:39 AM
Subject: Re: EOS EF 20-35 with extension tubes


> I just did a computation of DOF at 20mm with an f-stop of 22, and a
> focal length of 1.1 feet (should be close to 14 inches-it wouldn't let
> me use the inches number), and the computer told me that it would be in
> focus from 8 inches to 2 feet 3 inches.  Seems reasonably close to what
> you need?
>
> Here is the DOF calculator address:
>
> http://members.home.net/gillettm/DOF.html
>
> Mike

    Yes, thanks Mike, the tail doesn't have to be that sharp, just the whole
head. I guess I like to keep at around F8, and didn't realize how much DOF
will increase by stopping down signifigantly. Thanks, I'm going to try some
shots at F22 and see if that will do it for the dogs.
Jim



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