I am used to using 500 mL for ten sheets in an Expert drum, but that is for color only. I process b/w using other methods. This insert for the Patterson tanks really is not all that bad on chemistry. I use at least 250 mL just to process a single sheet in a tray, or 2 whole liters when doing a batch of 8-10 in a deep tank, so it is better than either of these options. The six sheets equal 1.5x80 sq-in, which is not far out of line for that volume of chemistry. While there are better options (such as the SS Nikkor that is as efficient as my Jobo tank), I don't think this is a bad one.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."
I have a day off tomorrow, as i travel to Paris for the final stages of the SS11 fashion shows, if you have any questions about my processors let me know, and I'll answer them.
OK, I'm interested in how well it might hold the film used in a rotary processor like a Phototherm. There is an issue of the film edge pulling out. (I realize you probably don't have access to a Phototherm to test this.) I can see that adding a small piece at the top and bottom corners of the sheets to provide more rigidity so the dynamic fluid pressure doesn't pull the film out might help.
And I'm interested in 5x7. Any concrete plans. I saw you mentioned it, but it takes effort to work out the details. A couple of 5x7 sheets in the same space so that it fits into the same tank would be pretty awesome in my mind.