Note its only 200 iso in cetain developers
None, as far as I know. The best is 160 or so which you could round up to 200; that's apparently what Foma does.
As to the emulsion question: it's apparently a mixed emulsion of T-grain and cubic grain crystals, which I interpret is "a partly successful attempt at creating a T-grain film, but not with the kind of process control in emulsion ripening that yields as good a consistency as Ilford and Kodak manage."
Microphen at 30c is stated as 200 iso, but its hardly normal development and at the standard 20c/contrast , I agree its typically a 160 film at best and many people rate it at 125.
As mentioned, it develops contrast FAST, thus the relatively short development times.
but the 400 kicks its butt
Flying C. - Close to my results with PMK pyro around 6 min dev time - it certainly develops fast! I had the best results shooting at half of box speed (at 100). And incidentally, don't use those Foma sheet film boxes for fresh or undeveloped film storage once it is taken out of the inner package - the corners leak light! One more quality idiosyncrasy.
Any idea why Microphen at 30 degrees C achieves box speed but presumably only achieves EI 160 at the more normal 20 degrees C Is there a known link between increasing temperature and boosting speed and if so is this a general link for all developers, only some or only Microphen?
Thanks
pentaxuser
Well Arcadia4 hasn't replied yet. 30 degrees C might have been a simple typo but it would seem not from the context in which it was written. So anyone else like to comment on my questions above?
Thanks
pentaxuser
Refer to fomapan 200 datasheet link above. Times are given for both 20c and 30c for most common developers. Only at 30c for 2min in microphen is the full speed achieved according to the curve data.
I agree its rather high temp so not a recommendation - ilford for example gives a temp range of upto 24c for microphen. However the short times indicate the temp to be probably not a typo, looking at ilford adjustment chart would need to be ca.6c difference to halve the processing time, and a lot of the times are less than half.
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