[pure-silver] Re: DS-10/HP5 curves and questions
- From: Craig Schroeder <craig@xxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 12 Jun 2005 20:54:02 -0500
Richard Knoppow wrote: How are you making the test exposures for your
sensitometric curves?
I've been taking individual frames of a Kodak gray card and also have a
Stouffer reflective zone scale that is just the right size and mounted
acrossone end of the card. I measure the card on-center in each frame on a
Macbeth TD-902 (calibrated). I also have a german Wallner projection
densitometer that is part of my Labex/Wallner modular darkroom
meter/timer/analyzer system. These agree within .02 whenever I've checked
and then I can also review the zone chart when it's projected. I've got a
shutter tester and know that the shutter speeds I'm using in combination
withmy typical ƒstop/shutter speed combos are accurate. I'm getting
less confident about my little jimmy-rigged system recently after this
episode and a couple of others. I think I was better off without so much
data! Do you see potential issues in what I'm doing?
I just bought a Bowens Illumitran slide copier rig and have heard that their
light source is very consistent and repeatable. I thought I'd try
calibrating to a projection step wedge and see if I can prove it to be
consistent. I could then just include one (or a few, if needed) frames in a
roll to verify or test combinations. Kind of a poor-man's sensitometer. Do
you think this might work?
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