Be sure to do testing with Tri-X!!! I used to shoot Tri-x at 250 but when i finally got around to doing real testing, Zone I landed on ISO 160 !!! This was confirmed by my mentor as well - "yes, I thought I'd let you figure that out for yourself" was his response (bastard! hehe). But then again, Tri-X was never "fine grain" to begin with. And is very prone to reticulation. TMax films are more resistant to reticulation. As for developer effecting Exposure Index, for normal development you should only get ONE exposure index in accordance to your combination of equipment, developer, dilution choice. When you do an N+1 then sure, you'll get a 1/3 stop change in EI for the increased density - so rate it 1/3 stops faster. For practical use, agitation method will not change your EI significantly enough to scream bloody murder. Developer dilution will though! The higher the dilution, the higher the compensating development occurs thus lowering ISO speed.
And yes, Mike is right.. If you don't do the proper testing, all it is is guesswork.
Attached are some Tri-X from 35mm.
Last edited by djklmnop; 11-07-2004 at 08:02 PM. Click to view previous post history.