About the rotation thing, with the stick and on a Jobo (or other rotating tank system). With the hand twister thing, the film does not leave the chemical and the rotation speed near the centre of the spiral is minimal. With a Jobo (or other constant rotation system) the tank is horizontal, not vertical, during rotation and every part of the film leaves the chemical momentarily on every revolution. The two manners of agitating are not comparable at all.
With a Paterson tank you may have to 'fart' the lid during processing due to the build up of gas pressure, but basically the tanks are designed for inversion and the most even results are achieved like that. I am assuming that you are not using a thirty-five year old Paterson with a screw-fitting top, leaky age-hardened plastic sealing-rings and rather slow fill/empty possibilities. If that is the case, I strongly recommend replacing it with the current version as they don't leak. The reel size is the same.
Last edited by MartinP; 09-13-2013 at 07:25 AM. Click to view previous post history.