Archived posting to the Leica Users Group, 2001/03/20
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At 5:49 PM -0800 3/20/01, leica@rakitzis.com wrote:
>Just wondering about filters in the back...
>
>They cause some focus shift, right? Which if you are shooting in a reflex
>or view camera is no problem, just refocus with the filter in place. But
>with a rangefinder I have to wonder if this is going to be a factor.
With gels the amount of focus shift is negligible. In practice other
errors will be greater and mask any actual focus shift.
>Furthermore, isn't the depth of focus narrower with wide-angle than with
>tele lenses (the opposite of DOF)?
No, it's the same for any f-stop. It's purely a geometric function.
>Without any hard evidence to support this, I would also share some of
>Tom's concern about putting a filter behind a super wide angle lens on
>a rangefinder camera.
>
>Byron.
I've done it for years. No problem.
- --
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
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