Agitation in PMK

Hi. I know that most people use agitatation in 15 sec intervals when processing roll films in PMK. Is there any special reason for that? PMK is quite slow working, so I would think uneven development is not the main reason and agitation will kill any compensating effect. Also, frequent agitation may cause some loss of speed. Anyhow, I would like to hear if somebody have tried different agitation rhytms in PMK and what the results looked like. I would appreciate any comments and tips on using PMK. You can also use my e-mail address

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