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Ultra Low ISO Film

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I shoot a lot of sub-50 ISO film, or higher film with ~5 or more stops of filtering. I don’t treat it any differently than faster films other than the fact that I can shoot wide open in bright sunlight. Most of my shots are outdoor in the bright New Mexico sun, so I don’t know whether you can get similar light in London.
 
Testing a newly restored and serviced Kodak Retina IIa with Svema/Astrum MZ3, at 2 ASA and processed by inspection (under safelight - its totally red blind) using Xtol stock. This MZ3 stuff is capable of delivering remarkable detail and tonality, if processed correctly.
Large version here: https://live.staticflickr.com/65535/49989920533_18b6055612_3k.jpg
MZ3.jpg
 
Testing a newly restored and serviced Kodak Retina IIa with Svema/Astrum MZ3, at 2 ASA and processed by inspection (under safelight - its totally red blind) using Xtol stock. This MZ3 stuff is capable of delivering remarkable detail and tonality, if processed correctly.
Large version here: https://live.staticflickr.com/65535/49989920533_18b6055612_3k.jpg
View attachment 248110

What time did you use for developing? Let's just say my first crack at MZ3 was nowhere near as successful.
 
What time did you use for developing? Let's just say my first crack at MZ3 was nowhere near as successful.

5 minutes in Xtol stock. As I mentioned, I developed it by inspection: pull it out of the developer around 3.5 minutes, and then I left it a bit longer. Under safelight, of course.
 
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At one point ILFORD investigated producing a 'Delta 25' film but I think they decided there wouldn't be sufficient demand or too much competition with Pan F Plus.

Delta 25?! Shut up and take my money!
 
Thanks Nodda, nice work!

The film is ~10iso, no worries if nobody is interested in discussing ideas, I imagine a cool low iso idea will come to me as soo as I finish the roll.
If you're talking about B&W, I'd suggest a compensating developer to keep the contrast under control. I've been playing with Beutler recently, which seems very promising so far in that regard, but there are tons of low-contrast developer options

I've found with iso 25, on average you can get a 5.6 or 4 at 1/125 if there's enough light. I've done some handholding at iso 12 as well.
Yeah, I wouldn't call 25 - or even 10 - "ultra" low. 3 and lower? That's ultra low.
 
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