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

Subject: Re: [OM] Ring flash or two-flash setup?
From: PCACala@xxxxxxx
Date: Fri, 6 Feb 1998 03:16:25 EST
Hi all:

This thread got me testing out a manual flash setting for my 80 mm F/4 on a
Telescoping Auto Tube.  I'm real pleased with the results and look forward to
catching the spring bloom.  It just started here, at least in Death Valley.
If the next California soaker reaches the desert again, we could have a
wonderful spring bloom.

The following will be of limited usefulness to most, given the electic mix of
equipment, but I offer it for the macro addicted who have come out of the
closet over this thread.  If anyone has a T-32, a T-20, a Bounce Grip 2, and
optionally, a Wide Angle diffuser for the T-32, then this is for you:

I basically only use the 80 mm when I need to go 1:1, so I only tested for 1:1
But with a little application of the bellows effect formula, it can be
modified.  I tried three flash arrangement combinations:
1. T-32 on grip in High and T-20 in hot shoe
2. T-20 on grip and T-32 on Low in hot shoe
3. T-20 on grip and T-32 on High with Diffuser (2x ND) in hot shoe

Best manual flash setting with Agfachrome RSX (ISO 50) film:
1. f/22
2. f/22~16
3. f/18

Combos 1 & 2 were equally contrasty lighting, although very pleasing and
resulting in higher apparent sharpness than 3.
Combo 3 had more open shadows, but sacrificed the sharpness associated with
contrasty light.

In conclusion, the wide angle diffuser really works to open shadows, but the
slide will look less sharp.  It is a toss up for what is best.  1 or 2 vs. 3
have their place depending on the subject.  It certainly beats the harsh
shadows from a single light, or the wierd dual shadows from equally balanced
lighting.

Thanks to all who suggested trying dual, unbalanced flashes.  Now my only
problem is that I'm stuck using Kodachrome 25 if I WANT to worry about the
loss of sharpness due to diffraction.  At 1:1, f/16 is the smallest useable f
stop.  But I failed to detect its influence at f/32 or f/22.  I wonder if this
is something only a mathematician would worry about?  Thank goodness I've
allowed myself to stop down a bit past the limiting aperature all these years.

Gary Reese
Las Vegas, NV

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