The Digitaltruth Massive Dev Chart has no entry for 120 Ultrafine Xtreme 100 developed in Rodinal 1:100, so I decided to give it a go. I used 18 minutes as a starting point, with a one-minute presoak. Developing time was actually 15:52, adjusted for temperature. See more below.
I also used a reduced agitation scheme: continuous for the first 30 seconds, twice every five minutes after that. The image could stand a bit of burning in the sign, I think. It's also best viewed in the "Lightbox" mode. In another version, I used the "Dehaze" slider in ACR to good advantage.
Ken, at 1:100 how much Rodinal did you use? I ask this as the minimum stated quantity for success does seem to vary a bit but everything looks fine here.
@pentaxuser 5 ml Rodinal (I understand this is the minimum recommended amount), and 495 ml distilled water in a plastic Paterson tank. Thanks for saying it looks fine, although to my eye the development "tamed" the Ultrafine film a bit -- I'll develop another roll soon using D-76 and a less relaxed agitation scheme to see, but I'm used to Ultrafine being bright and even "edgy." As I say, I'm not sure if my perception here is off, but I'll report on the test.
Thanks for the reply Ken. It is always difficult to judge a negative from a positive scan and I have no knowledge of scanning being a neg to darkroom print person but while there is evidence that 6ml is regarded as the minimum, your 5ml seems to have worked OK.
@PhotoBob I have a 645 1000s. That's the only version I've owned. In the eighties, I really wanted a Mamiya but couldn't justify the expense (photography was a hobby). When I returned to film photography several years ago, the first thing I did was check on E-bay. The camera I have cost $300 and included a 150mm lens. Recently I bought a 120mm lens, for about $200. I also bought a split-ring focus screen because I was having trouble focusing the thing, even with my glasses on. Now, as I've noted elsewhere, I wear 1.5+ reading glasses to focus my camera. Whatever works! Thanks for asking about my camera.