Response to 1 roll in a 2 roll tank

I never use two reels in a two reel Paterson System 4 tank when developing one film, which I do 99% (nearly always) of the time. I've never had a problem with the spool moving on the central column, it's a firm fit. I usually want the other spool dry so I can run another film straight away.

As far as agitation is concerned, I usually invert 3 times every minute, twisting the tank as I go. I believe those 3 inversions take about 6-7secs, so if you're inverting 5 times every 30secs, that's a lot higher ratio of agitation to sitting time. Not necessarily a bad thing, but maybe you need to accomodate it with shorter development times. Some experimentation might be in order. I think it's a good thing the System 4 tanks have a lot of air space (in the funnel area) so the developer gets to mix thoughly

This might be way of the mark, but is it a Kodak thing to agitate every 30secs (I use Ilford/Agfa developers) cause whenever anyone says they agitae every 30sec it's usually about a Kodak film (bit of a generalisation).

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