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Re: [OM] Focus accuracy tolerances {was: 28mm Zuiko won't focus at infin

Subject: Re: [OM] Focus accuracy tolerances {was: 28mm Zuiko won't focus at infinity
From: WKato@xxxxxxx
Date: Sat, 5 Jun 1999 12:57:57 EDT
In a message dated 99-06-05 09:30:37 EDT, you write:

> However, one must ask the question (and I don't have the answer) how
>  *critical* the alignment of these dimensions are in order to have a sharply
>  focused image on the focus screen produce a sharply focused image on the
>  film plane.
>  
I was wondering the same myself. Looking at some zoo slides of birds taken 
with my Tamron 400/4 wide open it seems the main point of focus was about 1/2 
inch closer than I focused with my OM2S body. At this tolerance level, the 
focus screen adjustment might be in the microns. Maybe there's a speck of 
lint between the focus screen and the seat for it? I'll try critical focus 
with some of my other bodies and see what I get.

Warren

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