Ah, I'm one roll less
Constipated I've been doing some Rodinal tests with Acros and had this roll around for a month shooting test subjects on my newly established EI while waiting for it not to rain. I'm working on a sort of semi-stand, 1+100 at, so far, 20 min. This roll was the first after conducting a speed test. It appears my working EI is 160 rounded off to the nearest std ASA. I measured for a density of 0.1 above the film base + fog density for Zone I.
There are so many recipes out there for developing Rodinal. It seems everyone has a different agitation profile too. I used one I got off the net and notice my negatives seemed too dense. So I thought I'd find out. And I was right. So I elected to alter the agitation profile to see if it would bring my speed down ( it was higher) while keeping the time the same. As some of you know I use a machine I made to agitate my film. I put in a new profile that does the agitation less aggressively than was posted. It's now 3 inversions in 15 seconds once every minute for 3 minutes and 2 gentle inversions every 3 minutes after that. That produced a negative more in the ball park and with what looks like finer grain too. So now being only 1/2 stop off from box speed means I really can shoot at either I suppose.
So far my zone V and Zone VIII densities are in the ball park at 0.75 and 1.30. I'm using density targets for a diffusion enlarger. I'm still testing if I'm going to keep the development time the same for and my Zone VIII densities. Here is a test shot using that new EI and agitation profile.
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