[LargeFormat] Focus Shift on Stopping Down
Ken Hough
largeformat@f32.net
Sat Dec 1 18:44:35 2001
The old timers knew all about this. It was normal on lots of lenses.
I simply refocus. No big deal.
Mt 12 in 4.5 Velostigmat I have was a NEW OLD STOCK lens when I un
earthed it. I disassembled it and had it multi coated.
Imagine my surprise when I had to change the focus 1/4 in at f 64!
The good thing is that the shift seems to stabilize at 22 - 64
Ken
From: "Clive Warren" <mobilton@hotmail.com>
To: largeformat@f32.net
Subject: [LargeFormat] Focus Shift on Stopping Down
Send reply to: largeformat@f32.net
Date sent: Sat, 01 Dec 2001 11:28:46 +0000
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We have heavy rain here in Bristol this weekend - at least it's not too cold
- the British obsession with weather is really only due to the large number
of wet weekends in Winter and sunshine during the week - for me that is when
you can't take the time out to do personal photography.....
Anyway, on this rather damp Saturday morning I was wondering about focus
shift on stopping down. Some lenses are more affected by this than others -
can be a bit of a pain if you are using compact field lenses that have small
apertures. Checking the ground glass is difficult enough when wide open, let
alone checking for focus at smaller apertures.
So, which lense types are most affected by focus shift? For example the
very bright Wollensak Velostigmat Series II 12" is affected....
Anyone have rules of thumb?
Cheers,
From the rain soaked leave strewn streets of Bath today,
Clive
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******Ken Hough Photographic Repair******
Specializing in Deardorff Refinishing
Lens Recementing and Shutter repair
Contribitor to McKeowns Price Guide
Deardorff Section
Custom machined Photographic items
Text Contents Copyright 1999 KHPR
http://deardorffcameras.0catch.com/
Est. 1980