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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