[pure-silver] Re: bellows contraction factor
- From: Peter De Smidt <pdesmidt@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 20 Apr 2007 17:17:09 -0700
Shannon Stoney wrote:
Hi, just wondering if there might be something called bellows
contraction factor. When I use my new wide angle lens, which of course
necessarily is closer to the film plane in a view camera, my negatives
look overly dense, even when I expose and develop the same way that I
do with the 150mm lens (for a 4x5 camera). I had the lens checked to
make sure the shutter was timed right, and anyway I am timing it
myself most of the time in seconds rather than fractions thereof.
Could it be that contracting the bellows causes more light to hit the
film, just as extending the bellows causes less light to hit the film
plane?
--shannon
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Or it could be that the apertures are slightly different than marked.
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