Anyone know of a lab I can send my 4x5 negative to so I can get a reading? Looking to find base plus fog negative value 0. Interestingly, I nave vision problems where I have trouble differentiating those very dark tones, so this would be a way for me to accurately establish my exposure / processing procedures.
Thanks.
View camera store—Fred Newman
Keith Pitman
Do you have a spot meter. Place the negative in question over your spotmeter's lens. Every 1/3 of a stop the spotmeter reading drops represents 0.1 log d. Or every stop represents 0.3 log d.
I think that in the "Fred Picker" years, finding the 1/3 of a stop with the older Weston meter was not so reliable. But with the advent of digital spot meters, the results should be identical to a densitometer reading. In fact my spot meter cost 3 times what I paid for my densitometer and the specs are better than my densitometer (if you believe the literature that came with the meter).
If you pm me, and include an SASE, I'll give you my address and gladly read and return them to you.
L
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