> > I noticed this the other day when trying to get enough light. I took off
a
> > vivitar short zoom lens, and put on a Zuiko 50/1.8, and gained a full
stop
> > of shutter speed (both at 50mm obviously, both at same f stop, same
scene)
> >
> > Wayne
>
> That may not be different between T-stop and F-stop, it could be the
> error (or high tolerance) on third party lens. I found the Tokina
> 28-70 3.5-4.5 SD is over exposed at least 2/3 stops if I use it in
> manual, so for this lens I will stick to auto and use exposure
> compensation dial if need. No problem found on other Zuikos (may be
> except the 28-48, which also seems to have some problem in this area).
>
> C.H.Ling
Okay, so maybe that is the reason that a third party (CPC) 135/2.8 lens I
have always seems to overexpose slide film. It always overexposes even in
auto or program mode. Does this mean that it is stopping down to a larger
than indicated f/stop? or that the f/stops aren't accurate? And can this be
adjusted for in any way other than compensating the camera settings when
this lens is on. That would be just too much of a pain to, say, reset the
asa everytime I put this lense on and off. Maybe I need to look for a Zuiko
135??
Wayne
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