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Re: [OM] 18mm filters

Subject: Re: [OM] 18mm filters
From: PCACala@xxxxxxx
Date: Tue, 27 Apr 1999 05:04:25 EDT
Christoph writes:

> The max. light fall off was measured (they called it vignetting): 
>  At F 3.5 it is a factor of 2.6 
>  at F 5.6 it is 1.7 
>  and at F 8 it is 1.3

Following those results, my C vignetting grade would be about 2.5X brightness 
in the center vs. the corners, and my B grade would be 1.5X.  Since every 
lens has fall off, I'd venture to guess A (= can't see it) is around 0.5X.

Gary Reese
Las Vegas, NV

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