[LargeFormat] Focus Shift on Stopping Down

[Ken Hough]

I forgot.........Protars CAN but not always be the worse offenders.As do the 
Turner Reichs and Convertable Wollansaks.
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