----------
> From: Doug Nowlin <wa5ohb@xxxxxxxxxxxxx>
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] Oly supplimentary lenses
> Date: Sunday, May 10, 1998 10:14 PM
>
> I found many years ago that distance measuring is NOT reliable. The old
> method for flashbulbs used a guide number based on conditions of an
average
> room that reflected the flash off the surrounding surfaces. I tried this
in
> a cavern where virtually no light is reflected, and I hardly got an image
on
> the film. This is one reason I bought an Auto Strobanar as soon as they
came
> out. For cameras that use OTF control, distance measurement is a good way
to
> set the aperture. It will also work well under average indoor conditions.
A
> flashmeter is probably the most foolproof method, but it requires
> calculations for macro use.
>
> Doug
Hi Doug,
May be you are right, I have not idea on the very old flashbulbs, but for
the two T32, one F280 and a T20 that I have, they are all over 1 stop below
the claimed value when working in a normal room with no ambient light, at 1
meter away from the object. But I always take this into account during
calculation. For indoor and outdoor flash photography where I needed to
balance the ambient light, I always calculate the aperture or the flash
power required by checking with the object distance (I use T32 Wide/ND
adapter set to reduce the flash power if required). This is the best
method I found, the TTL flash only work when your object is very large or
the background is very close to your object but unfortunately most of the
cases are not, especially for shooting people outdoor.
I agree that in macro mode the TTL flash come more close to the ideal. But
with different objects, for example different color of flowers, you have to
set some +/- compensation to reduce the error. If using incident flash
meter and you can place the meter at the same level as your object, I don't
see why you have to do calculations, unless you want some special effect or
simply you are doing photomicrography where there is no room for the meter.
C.H.Ling
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