[ Post New Message | Post Reply to this One | Send Private Email to Pete Andrews | Help ]

Response to T-Max film -- EXPOSURE INDEX AND DEVELOPMENT

from Pete Andrews (p.l.andrews@bham.ac.uk)
What sort of densitometer did you use, and are you sure it's accurate?
I'm very suspicious of your base+fog reading of 0.06, this is far too low to be real. Most base+fog density readings come out in the 0.12 to 0.15 region. I doubt if the film base alone would give a reading of less than 0.1.

Aha! I see you mention a Sekonic meter in conjunction with the enlarger lens. If you're trying to read density from the enlarger baseboard, forget it. It's almost impossible to get sensible density readings like that, for the simple reason that all manufacturers data is based on diffuse density readings, which you simply can't get from a projected image.
Why not use Kodak's published curves for Tmax and RS? They're readily available from Kodak's website, and have been measured using equipment and methodology far more accurate than the average user has access to.

(posted 8731 days ago)

[ Previous | Next ]