?? Sheet Film With Extended Red Sensitivity ??

[Old-N-Feeble]

I'm looking for 4x5 sheet film similar to Rollei Retro 80s and 400s. What I want is extended red (not IR) with very fine grain.

 

[alanrockwood]

Fomapan 200 and 400 and retropan soft 320 sheet films have red sensitivity almost to 700nm. Would they do the job for you?

 

[Old-N-Feeble]

Hi Alan, I don't know but I'll have a look.

 

[scheimfluger_77]

I've noticed some HP5+ images exposed through a dark red filter look like they have some extended red sensitivity. That could just be a scanning artifact but who knows. Another thing I've noticed is the spectral sensitivity curves for 320TXP (see page 10, http://www.freestylephoto.biz/static/pdf/product_pdfs/kodak/Kodak_Tri-X.pdf). The curve ends at 400nm but at the height of sensitivity, like it's just cut off. I wonder how far into UV it goes, and I think an interesting experiment with a UV pass filter on 320TXP could be enlightening. Not willing to fork out $150 for one filter right now though.

Food for thought.

 

[Anon Ymous]

Ordinary glass absorbs most of uv radiation below 350mm, so regardless of how far into uv 320TX goes, your lenses. will not let it reach the film.

 

[Old-N-Feeble]

I'm not concerned about UV. I can filter that out. I want extended red sensitivity... to near or very slightly into infrared.

 

[Athiril]

Delta 400 has extended red, otherwise Fomapan 400 has extended red a bit further than Delta 400, Fomapan 200 also has it iirc the same as 400, but only in it's sheet size (which is what you want). RPX 25 also has the similar extended red by the looks of it, maybe even a bit further, Delta and Foma appear to drop sharply right before 700nm (other films earlier)

RPX25 appears after 700nm http://www.argentix.ca/specs/245.pdf

Rollei 400S/Infrared is available in 4x5 last I looked too.

 

[Old-N-Feeble]

Thank you!! It looks like RPX 25 and Rollei IR 400 come very close to what I want. I'd also like to find something with mid-speed ISO.

 

[DREW WILEY]

Tech Pan was extended red; but it's getting awfully hard to still find in 4x5, and of course, needs special developers, which are still available.
I have a stash of 8x10.

 

[Sirius Glass]

Ordinary glass absorbs most of uv radiation below 350mm, so regardless of how far into uv 320TX goes, your lenses. will not let it reach the film.

He is interested in the other end of the visual spectrum.

 

[Old-N-Feeble]

Tech Pan was extended red; but it's getting awfully hard to still find in 4x5, and of course, needs special developers, which are still available.
I have a stash of 8x10.

Rollei ATP 1.1 is very similar to Kodak Tech Pan and it extends all the way to 820nm which may be further into IR than I want. Also, I'm not sure I'll like the tonality. I'll research it though.

 

[DREW WILEY]

Sorry, can't help you there. I tried a bit of it for highlight masking, but never for continuous tone use. Preferred Tech Pan.

 

[removed account4]

hi ONF,
i think it used to be EFKE 25 that was like this,
maybe there is an adox film that is the same as its conjoined twin ?

 

[scheimfluger_77]

He is interested in the other end of the visual spectrum.

I understand this. I merely suggested UV as an alternative as it likely will produce similar results, in B&W anyway.

 

[Sirius Glass]

Ordinary glass absorbs most of uv radiation below 350mm, so regardless of how far into uv 320TX goes, your lenses. will not let it reach the film.

He is interested in the other end of the visual spectrum.

I understand this. I merely suggested UV as an alternative as it likely will produce similar results, in B&W anyway.

Like the Wood effect, for example? :confused:

 

[Old-N-Feeble]

hi ONF,
i think it used to be EFKE 25 that was like this,
maybe there is an adox film that is the same as its conjoined twin ?

Hi John, I don't know but I'll research it.

 

[Anon Ymous]

I understand this. I merely suggested UV as an alternative as it likely will produce similar results, in B&W anyway.

I don't know what the effect would be in a landscape shot, but anything involving portraiture will get very ugly. It will accentuate every imperfection of the skin. Any freckles, even very light ones will show up on the film, as well as any bruises. AFAIK, UV photography is used in forensic laboratories because of this.

 

[Ricardo Miranda]

I'm looking for 4x5 sheet film similar to Rollei Retro 80s and 400s. What I want is extended red (not IR) with very fine grain.

What you want and what is available are 2 separate things.
Fomapan 200 and 400 have extended red sensitivity, but they aren't exactly the finest grain available.
http://foma-cz.cs4.cstech.cz/en/fomapan-200
They peak at nearly 700NM.

If you can't find these sheet films in your country, here is an APUG sponsor that has them: http://www.fomafoto.com/index.php/vm/b-w-film/sheet-films
Enjoy!

 

[Black Dog]

hi ONF,
i think it used to be EFKE 25 that was like this,
maybe there is an adox film that is the same as its conjoined twin ?

That's true IME-there's a Rollei RPX 25 available which I'm going to try.

 

[DREW WILEY]

UV as an alternative?????????????????????????????????? So now reddish sunrises and sunsets no longer exist, because short and long wavelengths are similar? Put a deep blue filter over your film instead of a red one and look at the difference. Or look at some old 19th
century prints made with blue-sensitive film. They can be beautiful, but due to exaggerated atmospheric effect, not cutting through it. Nor
will you obtain similar effect photographing vegetation as near-IR. UV lenses are available for microphotography and more rarely, for film
cameras; but ordinary lenses block a lot of UV.

 

[removed account4]

if ilford sfx200 is made in sheet film sizes ( don't think it is )
i can't remember but i think it was told it had extended sensitivity somewhere
so if you used a DEEP red filter you got a sort of weird infra red look without infra red film.

 

[Old-N-Feeble]

That's right, John. But, as you noted, it's not available in sheets.