TMax 100 and 400 and D-76

[Macwax]

Can some one give me rotary drum processing time recommendations for 4 x5 TMax 100 exposed at 50 and TMax 400 (old) exposed at 200.

Am I better off using D 76 or D 76 1 to 1?

Thanks,


John

 

[Lee L]

http://www.kodak.com/global/en/professional/support/techPubs/f4016/f4016.pdf

Page 8 for D76 rotary processing.

 

[Macwax]

Thanks for the reference.

I rated the TMax 100 at 50. Do you have an recommendation for changes in processing time?

 

[Lee L]

Changing processing time will change the contrast. It won't change the film speed much. You've got plenty of headroom for highlights with TMX, so I'd go with the time for normal contrast as you can just "print through" any excess shadow detail you have and still use a normal grade paper. Besides, many people use TMX at EI64 with D76. You may find that's actually normal for you. You'll need to tweak things anyway for your setup: agitation routine, enlarger type (condenser/diffuser), enlarging paper, paper developer, etc. But EI 50 with TMX in D76 with Kodak recommended times for normal contrast is a very good place to start.

Lee

Here's another good reference for you: http://www.jobo.com/jobo_service_analog/jq/jq9403.htm

 

[Macwax]

Thanks for the reply Lee. Do you have any thoughts on straight D 76 vs. D 76 1 to 1? I accidently processed some 4 x 5s the other night at normal time, but with a 1 to 1 dilution. Very thing negs.

 

[Lee L]

http://www.kodak.com/global/en/professional/support/techPubs/j78/j78.pdf

Second sentence:
"For greater sharpness, but with a slight increase in graininess, you can use a 1:1 dilution of this developer."

This is caused by the lower concentration of sodium sulfite, a grain solvent, in the higher dilution.

Dilution will obviously also lengthen processing times, which can be handy at times. Many people find that they prefer to use a lower EI (effective film speed) with D76. If you shot at box speed and underdeveloped, thin negatives is exactly what I'd expect.

Lee

 

[Macwax]

Thanks again Lee. I appreciate the help. I'll give my back up negs another try and see how it works out.

John