I was told that all GN-ratings are really optimistic. GN's would only aply
indoors, with white walls and ceilings in a not to large room. Is this a
common opinion? I never tested any T series flash for this since I use these
on their TTL setting for normal flash photography.
Daan
> I've found it necessary to test every flash I've owned for precise work,
> particularly with slide film. But I've never encountered a flash that so
> seriously underperformed its rating. Maybe a half-stop at most. Either
you
> found a rare bad sample or something was set incorrectly - either the
flash
> or flash meter. Auto-flashes can often be fooled by certain situations:
> too-bright or too-dark ambient light; reflective backgrounds; etc.
>
> Lex
> ===
>
> >From: John Hudson <xyyc@xxxxxxxx>
> >Subject: [OM] Flash guns for OM4T
> >Date: Tue, 19 Sep 2000 22:34:35 -0700
> >
> >I tested a new-out-of-the-box Vivitar 285 today with a flash meter at 10
> >feet at 100 ISO and found the output to be only f 5.6! At 5 feet the
> >reading was f 8 ..... in both instances two full stops of underexposure
> >or, in other words, only 250f rated output...
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