Help needed with t-max rs

[John Brady]

I am looking for some advice on development times using the following method.

T-max 100 4x5 sheet film, shot at 100.

Develop in t-max rs, mixing part a and b together as stock and then diluting at 1:9 as a one shot developer as I have heard John Sexton reccomended in his work shops.

Develop in btzs tubes at 75f deg f.

What would you reccomend as a normal (N) developing time for continuous agitation tube processing?

I hope this is enough information for you to go on. Any help would be appreciated.....

[Michael Heald]

Hello! I shot TMax 400 at 1:3 and 1:7 at room temperature and 1:9 at 75 degrees using a Unicolor tube for continuous agitation. All N times were about 8 min (usually closer to 7 1/2 min). From the data sheet, TMax 100 and 400 are close. At 1:7 dilution, I can get about +/- 1 1/2 stop contaction and expansion. The speed varies from about 250 to 500.
I didn't test TMax 100 extensively, but N development was about the same as I remember. Best regards.

Mike

[Amund BLix Aaeng]

Whenever I try something new, I use the manufacturers recommendations for development. As you`re diluting 1:9 instead of 1:4 I`d do 12 minutes. Kodak says 5 1/2 minutes at 1:4.