Andy, here's a few thoughts on your post:
Re: T-20 vs. T-32: I wouldn't want to use a T-32 on an OM-1/2 for fear of
breaking the hot shoe. 'Course, if it's already cracked, I guess it
doesn't matter.... Anyway, it is for this reason that I have elected to
hang onto my T-20.
That's an EXCELLENT deal on that T-32, by the way!
Re: X/FP switch on the OM-1: This changes the flash synchronization scheme
(FP for focal-plane-shutter flashbulbs (e.g. LONG duration) and X for
electronic flash). Bottom line: unless you have a cache of flashbulbs
laying around, set the switch to X and forget about it. Max. shutter speed
on the OM-1 for proper X sync is 1/60 sec., but anything slower would also
sync up.
Re: calculator dial (flash 101): You have it exactly. Set the calculator
for your film speed, decide what aperture you want to use (one of two for
the T-20, one of three for the T-32) based on distance, desired
depth-of-field, etc. and set the lens to that aperture. The flash will now
give you the proper amount of light at all flash-to-subject distances out
to the one corresponding to the aperture that you chose.
I'll leave it to others to discuss how flash guide numbers work. I know
that the flash guide number is a relationship between film speed and flash
energy (the guide number is properly expressed at a certain film speed, not
just by itself). I personally don't pay any attention to them; I just set
up for full-auto or TTL-auto and fire away.
regards,
Mahlon
------------------------------
Date: Sat, 30 Jan 1999 08:12:39 GMT
From: andymdrm@xxxxxxxxxxxxx (Andy Meldrum)
Subject: [OM] Careful what you wish for, part T32..
<snip>
I then went home and popped in to have a look at the T32 I had seen.
It was in great shape (could have been brand new, bar a few shallow
scratches on the perspex lens). To cut a long story they ended up
asking AU$100 for it, which I immediatly took! Then off to try it out
on my son's birthday outing to a climbing wall !!
So I now have a T20 & a T32. (The T20 has a calculator in feet, as I
bought it in California, the T32 is in metres..) I was planning on
selling the T20, but I get the impression the T32 is almost too big to
mount on the flash adaptor of the OM1. Its a heavy beast, and a lot of
the weight is a long way from the mount. Can this be a problem ??
Should I hang on to the T20 for use on the body ??
My next question is a lot more basic, but I still can't get my head
round it.
What exactly is the function of the X/FP switch when shooting
manually, which is all the OM1 does, and how should I set about
shooting with a flash...
As far as I can tell in the X position the flash is timed to flash
when the shutter is open when shooting at 1/30s. i.e I should set the
shutter speed to 1/30s when shooting with a flash. The aperture is
then chosen from those available on the calculator if in auto mode (2
choices on the T20, 3 on the T32), or manually, based on the number
(20 or 20/32) and the aperture, I guess... What is the relationship
between 20/32 and aperture and here do the numbers 20,32 come from
anyway ??
And FP??? Whats that all about. I get the impression it is related to
real live flash bulbs, but thats it !!
<snip>
Andy.
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