4x5 Extended Red Films... Rollei RPX 25, RPX 400... Any 100 ASA ??

[Old-N-Feeble]

I'm aware that Rollei RPX 25 and 400 ISO films have extended red sensitivity. I'm NOT looking for true infrared films. But... are there any 4x5 100 ISO films similar in spectral sensitivity to Rollei RPX 25 and RPX 400?

 

[destroya]

rollei infra red and rollei retro 400s/superpan have extended red sens. they are not true IR films but go up to 750 i think on the RR400s/superpan and the rollei IR goes to 800. I shoot them in 120 and with an orange or red filter they are real nice. The 400s has a real film speed of about 100-160 so its in your wheel house.

the Rollei Retro 80s is 50 to 80 depending on your developer

 

[Old-N-Feeble]

Thank you. Would you estimate Retro 400s to be similar to Retro 80s in spectral sensitivity and grain?

 

[Nodda Duma]

Fuji Acros 100 extends into the red enough that astrophotographers use it to pick up the H-alpha line at 656nm (reciprocity characteristics are important for them as well). You'd have to dig into the datasheets to see how far beyond that it extends.

Ektachrome 100 also had this extended red sensitivity that astrophotographers took advantage. Provia 100 does as well, I believe..

 

[Old-N-Feeble]

Thank you. Acros doesn't quite reach far enough into the long-red, near IR range. I know Rollei RPX 25 and 400 do. Retro 80s would be perfect but it's not made in 4x5 sheets.

 

[davidmasek]

Have a look at Fomapan 400.

 

[destroya]

Thank you. Would you estimate Retro 400s to be similar to Retro 80s in spectral sensitivity and grain?

yes they are very similar. search thew web and you can find the data sheets on them. RR80s grain is finer than acros and tmax 100. i would say that RR400s is next to tmax 400, the finest in the 200-400 class. It is finer than delta 400. Its nice, if i want a t grain look i use tmax 400 and regular grain look i use RR400s.

the retros can give higher contrast than the average film by the way. look at this thread by Henning, it gives som grain and resolution comparisons.

https://www.photrio.com/forum/threads/rollei-rpx-25-grain-and-resolution.115244/

 

[grommi]

RPX 400, Fomapan 400 and Acros are not sensitized for extended red or near IR meaning more than about 660 nm. They are regular panchromatic, the Foma has 1 or 2 stops more speed at yellow to red light but goes down to zero beyond of red. E.g. see Fomas and Fujis data sheet.

Rollei 400s (mind the "s") is very nice imho in Xtol @ EI 100, the films real speed, and up to 750 nm. Can be used with or without IR720 filter. Already without filter it gives a very different look from regular panchromatic films and with filter you can get a nice wood effect and more IR look. Superpan 200 is exactly the same film, other name and still "wrong" boxspeed. And no, it's useless to try to understand Macos marketing. Nevertheless a really great film, made by the remaining real Agfa in Belgium.

4x5 Rollei Inrared (probably the same emulsion as 400s) is reported to have a thin 0,1 mm PET base and therefore could be too wobbly for LF. RPX 25 seems to go up to about 700 nm and to have the same thin base. But afaik these 2 are the only 4x5 films with extended red or near infrared sensitation. In 35mm or 120 there is still Ilford SFX.

 

[Andrew O'Neill]

Bergger Panchro 400.

 

[grommi]

Bergger Panchro 400.

Never heard of Bergger Panchro 400 having any sensitivity beyond red. Regarding that the OP is referring to RPX 400 you could name any panchromatic 400 film like HP5+, Kentmere Delta TMax Foma 400, TriX.,,, and of course Bergger 400.

But I'm pretty sure that the OP had Agfa/Rollei 400s in mind instead of Harman/Ilford/Kentmere/RPX 400. Anything else wouldn't make any sense. RPX 25 is another story, it shouldn't be in the RPX family at all regarding specs. It's a slow aerial film, again made by Agfa and packaged/distributed by Maco. And once again, it`s useless to try to understand the marketing of Macodirect. They bring good films, but the marketing is worse than abysmal.

 

[ottosoren]

Never heard of Bergger Panchro 400 having any sensitivity beyond red. Regarding that the OP is referring to RPX 400 you could name any panchromatic 400 film like HP5+, Kentmere Delta TMax Foma 400, TriX.,,, and of course Bergger 400.

But I'm pretty sure that the OP had Agfa/Rollei 400s in mind instead of Harman/Ilford/Kentmere/RPX 400. Anything else wouldn't make any sense. RPX 25 is another story, it shouldn't be in the RPX family at all regarding specs. It's a slow aerial film, again made by Agfa and packaged/distributed by Maco. And once again, it`s useless to try to understand the marketing of Macodirect. They bring good films, but the marketing is worse than abysmal.

Hi Concerning the Bergger Panchro 400, I tried this film using the infrarot filter of rolleiflex (>700nm). It produces a nice atmospheric photo but without wood effect. I wonder if I would expose it 3 stops more if wanna show something more...
This photo is clearly underexposed... I plan to study this in near future:

Athens 2017
Rolleiflex 2.8E (Model K7E) Planar 1959
bergger pancro film 400 iso:1.5/exp:400 + infrarot filter (>700 nm)

, Dead Link Removed

 

[grommi]

I bet you can use a >700 IR-filter (IR690 or IR720) with every real panchromatic film and expose long enough and get an image. Look with your eye through this filter at bright sunlight and you will clearly see a red image. With a SLR you can even compose the picture on the screen if you hold back the bright daylight off your eye.