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Re: [OM] Lens speed ratings (was Night shots)

Subject: Re: [OM] Lens speed ratings (was Night shots)
From: "Ulf Westerberg" <ulf.westerberg@xxxxxxxxxxxxxxxxxxxx>
Date: Sun, 6 Sep 1998 14:19:57 +0200
Gary Schloss wrote:

>I always suspected that OEM manufacturers rate their lens' speeds
>rather conservatively, whereas the independents often play fast and loose
>with the max. aperture numbers.  Vivitar might well be one of the worst
>offenders.  (Disclaimer: pls note that I have absolutely no proof for
>this, so take is for what it is -- just another internet rumor! :-))

When comparing my (now sold) Sigma APO 400/5.6 with a borrowed Tokina
400/5.6, I got shutter speed differences equivalent to half a stop wide-open
to the Sigmas's advantage. At f/8, f/11 etc.  readings were exactly the
same.

Ulf Westerberg



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