Scala process and Rollei IR film

Gast · 2006-04-03T19:25:43+00:00

Auf meiner suche nach zw diafilm bin ich neben dem Foma R 100 auch drauf gewiesen das der Rollei Maco IR 400/820 im jeder scale process mitlaufen kan. Stimt...

Gast

Whilst searching for black-and-white transparency film, I came across the Foma R 100 and was also told that the Rollei Maco IR 400/820 can be processed using any Scala process. Is this correct, or does anyone have any experience with this? According to Mr Schroder (Maco), it should be exposed at ISO 200. The Scala lab in Belgium won’t perform the exposure. I’ve now sent two test films to Studio 13 in Stuttgart as a sample. If this film works, the new Rollei Pan 25 should work too. Does anyone have any experience with it? Guy Meurs Diest

FrankJBeckmann

Hi Guy, As the Maco IR 400/820 appears to be made by Gevaert, there’s a good chance it can be reversed using the Scala process. That might not be the case with the Pan 25.

Petzi

Hello, There is the Rollei Infrared and there used to be the Maco IR 820c. The two have nothing to do with each other. The Maco came from the Efke factory and has a spectral sensitivity up to 820 nm. The Rollei is probably made by Agfa Gevaert (aerial photography film?) and barely reaches 750 nm; I’d say it’s more like 730 nm. It’s a shame that Efke no longer exists.

FrankJBeckmann

Hi Petzi, How are Pelle and Pingo getting on? The Maco IR 820c (100 ASA) came from Fotokemika (Efke). The MacoMaco IR 820 (400 ASA), which has since been renamed Rollei Infrared, also goes up to 820 nm according to the spec sheet. But it wouldn’t be the first time Maco has – ahem – tweaked the specs a bit. And it really is an aerial photography film.

Petzi

The Maco IR 820c (100 ASA) was supplied by Fotokemika (Efke). According to the data sheet, the MacoMaco IR 820 (400 ASA) – which has since been renamed Rollei Infrared – also covers wavelengths up to 820 nm. But it wouldn’t be the first time that Maco has – ahem – tweaked the specifications a little. And it is indeed an aerial photography film. [right][post="7368"]<{POST_SNAPBACK}>[/post][/right]

I’ve looked at the Rollei Infrared datasheet; it includes the spectral sensitivity curve, which has already dropped by > 1.5 log at 750 nm – that would correspond to roughly > 5 f-stops, so it’s no longer significant. The film is also not marketed as a film for 820 nm; the number 820 merely appears in the (former) product name. There is no mention of 820 nm anywhere. They could just as easily have written 333 or 1234. The film is marketed as a “Panchromatic film with sensitisation extending into the infrared range”. http://www.rollei.de/cct/files/rollei/data...IR%20TA_web.pdf The Rollei Infrared (or Maco IR 820/400) is apparently the Agfa Aviphot Pan 400S, which is marketed by Agfa Gevaert as Panchromatic up to 750 nm. http://www.agfa.com/docs/sp/aerial/aviphot...06_01_09_en.pdf

FrankJBeckmann

Hi Petzi, I’d only seen Maco’s adverts. Their spec sheet still makes a big deal of the 820nm wavelength: http://www.mahn.net/TARIRe.pdf So they’re really banging on about it again. Just like the Rä is supposedly ‘Made in Germany’...

Petzi

Do have a look at the "Spectral Sensitivity" curve in the datasheet you linked to. Where does it start to drop off on the right-hand side? Also compare the Maco/Rollei curve with the "Absolute Spectral Sensitivity" curve in the Aviphot datasheet (see above). They are identical.

FrankJBeckmann

Yes, I agree with you there. I only just had a look at the data sheet earlier. But really, the only infrared film that’s actually interesting is the Kodak HIE. Or are there any other similar films?

Petzi

Yes, I agree with you there. I only just had a look at the spec sheet earlier. But the only infrared film that’s really interesting is actually the Kodak HIE. Or are there any other similar films? [right][post="7372"]<{POST_SNAPBACK}>[/post][/right]

I’m not really interested in HIE; it’s only (still) available as 135 35mm film. It’s also very grainy. The Maco (Efke) IR 820c was also available as roll film and sheet film up to 8x10". This film also goes up to 820 nm and should therefore produce similar tonal results to the Kodak HIE (which goes to just over 850 nm). That’s why it’s actually a shame that this film is no longer available. I still have a few sheets in 4x5" format in my chest. ;)

Gast

Thanks for the replies. I’d already suspected that it came from the factory in Mortsel, Belgium. The reversal processing with Studio 13 was good. The only thing is that the sensitivity should really be set to 100 for reversal processing. The film is quite strong. Guy Meurs

Petzi

Thanks for the replies. I’d already suspected that it came from the factory in Mortsel, Belgium. [right][post="7374"]<{POST_SNAPBACK}>[/post][/right]

I didn’t say that. Agfa Gevaert aerial films were manufactured at AgfaPhoto in Leverkusen. When it became known that the factory in Leverkusen was to be closed, Agfa Gevaert had the necessary stock manufactured there to last for five years. I don’t know where they will manufacture their films in future, but they have said they are working on a solution. They do not want to give up the business. I also don’t know whether the facilities currently exist in Mortsel to manufacture photographic films.

Gertrobert

I’ve recently had good results with ROLLEI INFRARED 820/400 film and the Scala process, having the film processed at Photostudio 13 in Stuttgart with an initial development time of 3 minutes 45 seconds. Based on the exposure bracketing I photographed, I found that the effective speed (not the actual speed of this super-panchromatic negative film) is ISO 64. :P

Christoph

Hi Gertrobert, That sounds interesting. Do you know what the standard initial development time is in the Scala process? I want to test the Rollei Infrared with the Foma kit as well. I’ve already had a go with the Rollei R3; I want to fine-tune things in terms of development time and actual speed, and then I’ll let you know how it goes. Best regards Christoph

MirkoBoeddecker

Just as the Rä is supposedly 'Made in Germany'...

Without wishing to take sides here: the R3 is made in Germany. Only the roll films are manufactured abroad due to a lack of domestic availability. Best regards, Mirko