What's the slowest ISO B&W negative perforated 16mm film that's readily available
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Possibly something ( like a non-camera film ) such as Eastman EXR ( 2378 / 3378 ) Sound Recording Film ?
There's no ISO speed for these films, and they're orthochromatic, so experimentation would be in order !
link here ... https://www.kodak.com/content/produ...STMAN-EXR-2378-3378-technical-information.pdf
John S
Yes, 2378 is low speed but engineered to be extremely high contrast to obtain crisp track wave forms on optical tracks.
2234 is Panchro Dupe neg, 2366 is Inter positive (Ortho; can also be processed as negative) and 2302 Fine Grain Positive (Ortho; can also be processed as a negative), but the latest Kodak price list does NOT list them available with 16mm silt/perf specs!
All of the above have a equivalent ISO of somewhere between 6 and 12, as I seem to recall.
It should be a 5000 series if cut and perforated for 16mm; i.e., replace the first digit of the stock with a "5" = 5324, etc...
I would suggest you call a working motion picture lab, like Colorlab in Maryland and ask if you can buy a short end of one of the above stocks. Otherwise, minimum orders for non-listed Kodak stocks tend to start at 250K feet.
2234 is Panchro Dupe neg, 2366 is Inter positive (Ortho; can also be processed as negative) and 2302 Fine Grain Positive (Ortho; can also be processed as a negative), but the latest Kodak price list does NOT list them available with 16mm silt/perf specs!
All of the above have a equivalent ISO of somewhere between 6 and 12, as I seem to recall.
It should be a 5000 series if cut and perforated for 16mm; i.e., replace the first digit of the stock with a "5" = 5324, etc...
I would suggest you call a working motion picture lab, like Colorlab in Maryland and ask if you can buy a short end of one of the above stocks. Otherwise, minimum orders for non-listed Kodak stocks tend to start at 250K feet.
Positive print stock is always a good entry for the experienced as well as the beginner. Labs have print film in stock. Non-sensitised but of fine graininess and not expensive, developed in three to four minutes, you can see what a lens is delivering, how accurately you focus, how lighting might be improved, whether the whole setup is worthwhile.
Print films are not made to a given exposure index, therefore batches vary in sensitivity. Generally they are around ISO 8 to 10.
I agree that slow stocks are missing. Manufacturers have let themselves carry away from the real/reel thing which is how 16-mm. cinematography had begun. FOMA BOHEMIA could make a Fomapan R 20. That would be most welcome.
Print films are not made to a given exposure index, therefore batches vary in sensitivity. Generally they are around ISO 8 to 10.
I agree that slow stocks are missing. Manufacturers have let themselves carry away from the real/reel thing which is how 16-mm. cinematography had begun. FOMA BOHEMIA could make a Fomapan R 20. That would be most welcome.
A lot of people say that Fomapan 100 actually is a 50 ISO film, so this would get you under 100 ISO. If you then pull-process by one stop you should have 25 ISO.
What do you need a slow 16mm film for?
What do you need a slow 16mm film for?
For filming in the snow, at the beach, everywhere where you have plenty of light, for a fine graininess, a smoother image, less depth of field at wider apertures, simply for a better quality than with high-speed stocks. I imagine slower films can be manufactured more cheaply because they take less ripening time.
I meant what the OP wants a slower film for - as he asked for a film below 100 ISO but then bought some IR film at 200 ISO.
Fujifilm HR-21 microfilm iso 25 and they are still in production
嗯，我知道的其他胶片只有 Fomapan Cine 100，这是感光度最低的 16mm 带孔黑白负片，以及 Fujifilm HR，这是我所知道的感光度最低的 16mm 缩微胶片。如果要装进需要打孔的机器，比如 Rollei 16，打孔确实很麻烦。不过，我在 FPP 上见过一些感光度低于 100 的黑白负片，但我没试过，比如 FPP Sonic25 BW Negative。
Readily available are Kodak Plus-X reversal, ISO 50 and BW40 reversal ( ? ) from the Film Photography Project.
Microfilm can be perforated.
Microfilm can be perforated.
Adox CHS-20 II, usable between ISO 12-20. Microfilm, literally 500 MP resolution in 135 format. 
When your 35mm film should look like medium format.
When your 35mm film should look like medium format.
The sharpest 35mm film? ADOX CMS 20 II PRO & ADOTECH IV Review
Adox CMS 20 II Pro Black and White Film Review | All About Film
CHS-20 seems no longer available anywhere. The slowest that you can buy today is Foma 100.
You can get them from Fotoimpex, Berlin - Germany. 12 EUR per 135-36 roll.
They can, $600 for a 300m roll (they have to slit and perf the entire 35mm pancake)
We are talking about perforated 16mm here.
I am sorry, you're right. Damn, i haven't had my glasses on, was sleepy.
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