Ultra Low ISO Film

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abruzzi

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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.
 

removedacct1

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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
 

grooves1200

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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.
 

removedacct1

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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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flavio81

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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!
 
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Pentode

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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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