've read rumors that Ultrafine eXtreme is re-badged Kentmere. I've never tried Kentmere myself, but you seem confident enough to go on record that it is Kentmere. Have you shot them side by side? Or some other inside knowledge or source?
Thanks for the links, @Bormental, those are really interesting and insightful! In a blind test, I probably couldn't tell the difference. But in a wallet test, 100-feet of Ultrafine eXtreme 400 is cheaper than 100-feet of Kentmere 400.This thread on dpreview is very much aligned with my experience:
https://www.dpreview.com/forums/post/64005270
I have not used Ultrafine 400 in 135 format, and Kentmere 400 is not available in 120 AFAIK. But I have been buying 24-frame rolls of Kentmere 100 and Ultrafine 100 for a while now, sometimes even developing two rolls in the same tank, using the same development time and seeing zero difference in my results.
And since it's so likely that Ultrafine 100 = Kentmere 100, it would be only logical to conclude that the same is true for the 400 version.
1. I think it is probably the lack of an anti-halation layer that you notice. I have no problem loading it, but I keep my rolls to 24 or under. I have a hard time getting the last bit of a 36 frame roll onto a reel, no matter what brand. I REALLY like how flat this film lies for scanning.
In my experience, Ultrafine eXtreme 400 doesn't perform quite as well as say Tri-X or HP5+ in strongly backlit, high contrast scenes. With really bright sources, there is some mild halation. I've read elsewhere it might be because it has less anti-halation undercoating (AHU). I have no way of confirming, but that might also contribute to the thinner base. When I dump out my pre-soak water, the liquid is clear, compared to Tri-X which comes out purplish.
I haven't tried pushing or pulling Ultrafine eXtreme 400. I generally shoot at box speed and meter for the shadows. I develop using LegacyPro L110 at 1:31 for 5.5 minutes at 68 degrees.
However, Ultrafine 100 and 400 are my favorite films regardless of the price
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