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06-14-2011, 09:00 AM   #1
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iso 25

Disclaimer - not pentax specific, but you guys are some of the most knowledgeable in the mf world.

I recently found a store that'll develop 120 film - color and bw. Googling, I've noticed several companies make bw film at iso25, which sounds awesome to use. (Second disclaimer - the mf camera I use is a Bronica sq which has a top shutter speed of 1/500 and I'm a big fan of using f4 and larger generally).

Which leads to the question, anyone know if any existing companies make a color 120 film rated at iso25? Or in the very least, had any experience with the bw film?

06-14-2011, 11:15 AM   #2
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I think the death of ISO 25 color negative film came with the end of the now older Ektar. But according to Kodak, the new Ektar 100 gives you just as fine a grain and thank goodness for a 3-stop ND filter for your f4 case on a sunny, summer day.

You can still get that slow in BW film. Efke and Rollei Pan come to mind. I guess you'd want to use those films for the more classic cubic grain in lieu of just as fine in higher speeds with the T-grain films.

You also have options with some BW developers that usually rate around EI50 or so for 100 films and shoot with a yellow filter and there is your EI25.

Last edited by tuco; 06-14-2011 at 04:12 PM.
06-14-2011, 01:13 PM   #3
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Ilford makes a nice ASA 50 (I can't type ISO!) film, the Pan-F Plus. I've used it successfully with many of my vintage cameras with good results. With a filter, or downrating it a bit, you can shoot ASA 25 if you so wish, and I'm sure the results will be fine.
06-14-2011, 04:49 PM   #4
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QuoteOriginally posted by dflorez Quote
Which leads to the question, anyone know if any existing companies make a color 120 film rated at iso25? Or in the very least, had any experience with the bw film?
I am not aware of color film of such low speed. Velvia 50 slide film is probably as slow as it gets nowadays.

In terms of ASA 25 B&W film there is a few choices there. Efke/Adox CHS 25 is one common option and the only one I am familiar with. Obviously, a very low grain film with outstanding resolution. It has a very high contrast which is something to keep in mind under certain circumstances.

Oddly enough, it's the one film that I don't seem to have shot in 120 yet, only either 135 or 4x5. It's particularly attractive in 35mm due to its low grain:


Pentax-M 135mm

The high contrast is more apparent here:


The 28 / 50 / 135 triumvirate

And in LF, grain has effectively become imperceptible. But Efke 50 or 100 probably would have worked equally well:


Plant on wall

Cheers,
Tassilo

06-15-2011, 12:24 AM   #5
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QuoteOriginally posted by Nesster Quote
Ilford makes a nice ASA 50 (I can't type ISO!) film, the Pan-F Plus. I've used it successfully with many of my vintage cameras with good results. With a filter, or downrating it a bit, you can shoot ASA 25 if you so wish, and I'm sure the results will be fine.
And I'm still translating in DIN

There is also the Rollei IR 400, which can be exposed, with red filter, between 12 and 25 ISO.
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