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Re: [OM] Lens Test

Subject: Re: [OM] Lens Test
From: Gary Reese <pcacala@xxxxxxxxxxxxx>
Date: Tue, 08 Aug 2000 11:01:52 -0700
If anything happens to a lens to decenter the elements, wide open
performance may falter. Any lens that can only get a C SQF grade wide
open will be harder to focus than one with a higher grade. 

I can predict a lens that will be C or worse wide open by the image I
see through a Varimagnifinder at 2.5x and on an all matte screen. But I
can't predict a B vs. an A grade. Said another way, for critical focus
ability, one needs a lens capable of B- or better wide open. Less than
that and critical focusing is guess work.

Gary Reese
Las Vegas, NV

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