Regardless of what developer and film I use, I try to use such combination which gives me longer dev time (usually 12-15 min).
Longer is boring, shorter than 10 minutes may induce uneven results, depending on how fast you drain and refill your tank.
For long development time (> 10 min), "regressive" method of agitation may be used:
1st minute - continiously
2nd - every 10 sec
3rd - two times per minute
4-5 - once in a minute
once on 7th and 10th minute,
and then once per 5 minutes
I used this method successfully with highly diluted developers, like Rodinal/R09
Longer is boring, shorter than 10 minutes may induce uneven results, depending on how fast you drain and refill your tank.
For long development time (> 10 min), "regressive" method of agitation may be used:
1st minute - continiously
2nd - every 10 sec
3rd - two times per minute
4-5 - once in a minute
once on 7th and 10th minute,
and then once per 5 minutes
I used this method successfully with highly diluted developers, like Rodinal/R09
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