Actually, I guess I lied. I can find some Sunpak stuff but I can't find
any Vivitar stuff and presume I never wrote it down. I was testing a
285 HV for a friend. To the best of my memory the actual power output
was about 3/4 to 1 stop less than advertised. The Sunpak and Oly are
similar.
Test condiitions for all my flash testing are in my family room which is
about 14 feet wide by 16 feet long but is open on the end where the
camera is located for another 20 feet or so behind the camea. The
ceilings are pure white and the walls are off-white.
Chuck Norcutt
usher99@xxxxxxx wrote:
> Chuck,
> Would be interested in your Viv data. Tried manual fill with Viv 283 with
> slides before joining the list. The GN was clearly apocryphal. I believe
> you had mentioned in the past that the manufacturers measure the output under
> "ideal" conditions with modest sized room with white ceiling and light walls
> etc. I have seen claims that the Viv 283 GN outside is about 50% of the
> stated GN. Under what conditions were your measurements made? Oh, I now own
> a T32 thanks to your post :-) Tx,
> Mike
>
> "There's trouble here if you're shooting slide film with
> manual flash. To be quite sure, Vivitar and Sunpak lie just as much as
> Olympus. I have data for Sunpaks and Vivitars too. Very similar except
> that I don't have as many multiple units so I can't make the same claims
> about the data not being due to sample variation"
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