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Re: [OM] Speed of lenses

Subject: Re: [OM] Speed of lenses
From: "Dirk and Carla Wright" <wright@xxxxxxxxxxxx>
Date: Sat, 07 Oct 2000 18:55:44 -0500
>Yes, and the film format difference is driven by the size of the image
>circle.  The 80mm f/2.8 Sekkor on my M645 is a much larger lens than the
>85mm f/2 Zuiko, even though it's slower by an entire stop.  That's because
>the image circle is bigger and must spread the light around a bigger film
>frame. 

So, if you buy one of those nifty Mamyia M645-to-OM adaptors and slap on a
Sekkor 80mm f/2.8, what do you get? It's still 80mm, but what is the maximum
aperture? f/2? f/1.2? What about that Sekkor 80mm f/1.9, the fastest medium
format lens ever made? What do you get? I can't do the math, to much
wine..........<hick>

Be seeing you.

Dirk Wright

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