[OM] OM2S with T32 Flash:
<< Does the camera pick the shutter speed no matter where it is on the ring?
>>
In Auto or Program mode, yes, I think!
<< The manual says to set the mode on the camera to AUTO and set the aperture
for auto OTF direct auto mode >>
1. To get a decent photo:
For TTL OTF (Through The Lens - Off the Film) Auto, you need to remove the
calculator panel on the T-32 (with the numbers on it) by pressing the little
button at bottom right and sliding it out.
Then slide it in the other way round, so you can see the phrase "Full
Automatic Control by OM-2"
Now in AUTO mode on the OM-2S you can pick any aperture you want, and the
camera will control the flash output and set synchronistion 1/60 shutter
speed.
Or in PROGRAM mode on the OM-2S you can set the smallest aperture (largest
f-number on the lens - f/16 for example), and the camera will control the
aperture, flash output AND set synchronisation 1/60 shutter speed.
But even with these, you are not _totally_ guaranteed to get correct
exposure. But the camera will tell you if exposure is correct or not - if
correct, the flash ready LED will flicker quickly after the photo is taken.
If you use AUTO mode on the camera:
If you are not sure what aperture to set, look at the calculator panel first,
set the ASA on it, and consider the subject distance you need to illuminate.
Read off the aperture scale the aperture required to give you enough light.
Then put the panel back with the "control by OM-2" side showing and set the
aperture and fire away.
The 32 of T-32 refers to the Guide Number in metres of the flash. Basically
at 100 ASA,
Guide Number =32 = subject distance x f-number needed
OK so something is 4 metres away, f-number needed is about 32/4 = 8 ... f/8
then.
Distant subject 16 metres away you need about 32/16 = f/2
Close-up subject 2 metres away you need about 32/2 = f/16
So in an ordinary room, f/8 might usually be OK, f/16 will always
underexpose, f/2 or something might always overexpose. With apertures a bit
wider than f/8 like f/5.6 or f/4, the TTL metering on the camera will cut off
the flash quicker, and you might still get a correct exposure. This is the
advantage of TTL Auto, you have a full choice of apertures and the
camera/flash will take care of the rest unless you're way out!
If you're not sure about all this, just set the camera to PROGRAM, aperture
to f/16, turn flash on and have the camera set everything for you.
Happy flashing!
Dave Bellamy.
http://members.aol.com/synthchap/
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