Archived posting to the Leica Users Group, 2000/03/29

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Subject: RE: Vs: [Leica] adapter problem with 15mm Heliar
From: "Peter Jon White" <PeterJonWhite@PeterWhiteCycles.com>
Date: Wed, 29 Mar 2000 17:58:45 -0500

However, I will
> take some test
> shots using an incident meter and another lens for
> comparison.  Thanks again,
> Dave Schaller

What are you going to test? Neither the lens nor the camera has an aperture
linkage. The alignment of the lens is irrelevant. If the lens is giving you
underexposures, it can only be because of a problem with the aperture
setting. If you set f:5.6 but the diaphram moves to a effective f:11 you'll
be two stops underexposed. But rotating the lens can't change anything.

If the Heliar is rotated too far, I suppose the hood could cause vignetting,
but that would have no effect on most of the image.

Peter Jon White
Peter White Cycles
666 Mass Ave
Acton, MA 01720
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