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Re: [OM] Tamron f2.5 / 135mm Adaptall2

Subject: Re: [OM] Tamron f2.5 / 135mm Adaptall2
From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
Date: Tue, 24 Jun 2003 17:36:09 -0700
(3.5/2.5)^2 = 2  yes the 3.5 is a stop slower than the 2.5

I think someone posted a link to a Zoomar 135 that was an insanely fast
f 1 ? within the last week or so. I don't think it will mount to your XA
and you would need a pretty big pocket  to carry it ...

-jeff
----- Original Message -----
From: "Lama-Jim L'Hommedieu" <lamadoo@xxxxxxxx>
To: "Oly List" <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, June 24, 2003 5:08 PM
Subject: [OM] Tamron f2.5 / 135mm Adaptall2
> snip
> 3.5 is 2/3 stop slower than 2.8, right?  Is 2.5 another 1/3 faster
still or something less?  My real question is when I switch from
> the 3.5 to the 2.5, is it a full stop's more light?  The Zuiko is just
barely sharp enough to use wide open but I'm not expecting
> miracles from a fast, 4 element design.  "It's not in the numbers" as
Captain Furillo would say.
> snip
> Besides the Series1 f/2.3, are there other speed demons in OM mount
that have some claim to image quality?  (Besides the Tamron
> 80-200 f/2.8, and Tokina 80-200 f/2.8)
>

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