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Re: [OM] Ring flash or two-flash setup?

Subject: Re: [OM] Ring flash or two-flash setup?
From: "Doug Nowlin" <wa5ohb@xxxxxxxxxxxxx>
Date: Sat, 7 Feb 1998 11:33:54 -0600


>A finer clarification is that with the 2s and 4, you are more likely to get
an
>"under" or "over" warning in the finder when shooting ttl flash.  I don't
know
>what the effects are with slides, but with print film,  your results are
>acceptable no matter what the warning is.
>With a 2N you'll get a blinking confirmation and a proper exposure.
>TTL flash varies flash duration from 1/1000 to 1/40,000.  It is possible,
though
>I am not 100ure, that the 2s and 4 may not be able to  manage the same
degree
>of control of the flash.  This could be a trade off to allow for multispot
>metering and other electronic control (seen and unseen).  Like:  If you
want 8
>spot readings, then otf flash control might be affected....
>Has anyone done any close up ttl flash work with slide film and always had
>perfect results, or are they under or overexposed?
>
>John
>Camtech
>

I wish I had conducted a more thorough test when I had an OM-4. I do know it
would indicate underexposure several stops before my OM-2N. I felt the lack
of indication was enough to cause me to stick with the OM-2N. I should have
checked with my flashmeter to see if exposure, indication, or both were off.
I used an OM-2S with a 135mm f/4.5 at 1:2 using a T-32 on camera for a
couple of years. It would indicate properly at f/32 using ASA 400 film.
Sometimes, f/45 would show proper exposure. When I ran into problems with
the OM-4, I was testing various 200-300mm lenses with a Nikon 6T diopter. I
used a Maxxum with a flash equal to the T-20, and it gave proper exposure
indication at f/22. I went to an identical setup using the OM-4 and a T-32,
and f/11 showed underexposure. This was not right. Incidentally, the Maxxum
also has spot and 9 spot averaging capability and a very good metering
system. I changed to an OM-2N, and f/22 gave the blinking light. The Zuiko
200mm f/4 did quite well in the tests. If someone has an OM-4, OM-2N, and a
flashmeter, they could test to see what is really happening. I do not
understand how anyone could have overexposure problems with ASA 25 film in
macro shots. I have used ASA 800 successfully (in the Maxxum) with the flash
a couple of inches from the subject with no lens extension to reduce light
transmission. Slower film will help eliminate ghosting from the ambient
light.

Doug

Doug


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