> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Jim Davis
> Sent: Saturday, February 24, 2001 11:44 PM
> To: [EMAIL PROTECTED]
> Subject: EOS EF 20-35 with extension tubes
>
>
> Well I want to shoot more closeup 'distorted' dogs photos,
> but I want to
> keep their noses in focus, and I find minimum focus distance to
> be not quite
> short enough with this lens for that purpose.
> Therefore I'm going to get an extension tube, or likely a set
> of tubes.
You may have a problem here. Wide-angle lenses have such small
depth-of-focus that even a 12mm extension tube may make it impossible to
focus the lens at all. Try holding the lens partially in the camera's mount
and you'll see what I mean. With my Sigma 21-35, even racking the lens out
by half the depth of the lens mount makes it impossible to focus.
A close-up lens may be your best bet.
Chuck Skinner
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