Posted: Fri Jul 10, 2009 5:13 pm Post subject: |
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Sevo wrote:
Seele wrote: |
A professional photographer who also taught photography told his students to expose Tri-X at ISO 100; a friend who was present said it was not right, but the teacher said he never got Tri-X to be any faster for many years. After discussing sensitometry etc for hours, the friend said he wanted to see his negatives. Of course, the professional always loaded his DDS with sheet film the wrong way round. |
Nice story, but hardly true - the backing on b&w sheet film is quite opaque and accounts for much more than a mere 2 stops of attenuation. Besides, Tri-X sheet is not supposed to be faster than 320 ASA. Developed with fine-grain developer to low Gamma (for point light heads) I always found even 200 euphemistic. Depending on personal measuring quirks (which may require a EV or two compensation to either side) ISO 100 is well within the expected range. _________________ Sevo |