What film responds well to red filter?

[fidget]

Hi, I had just started in mono, buying some nice gear that I could not have justified before the digital age, and had found Ilford SFX to be a wonderful match for my style of image. Not outright IR, but very responsive to red filters. I had just decided that SFX in 120 could be my standard film when, it was discontinued. I very much hope that it might be produced again in 120 (where can I beg or order my yearly quota?), but assuming that it won't be, what films out there have a marked response to a red filter?
Can an extreme response be obtained from a standard film with a darker red filter, given a long enough exposure?
Dave.....

 

[DrPablo]

Most films these days are panchromatic and thus have good spectral response to red light. Green tends to be the area of least sensitivity. You'd have to seek out orthochromatic films to find less red-responsive films.

If you want an expanded red spectrum there are the IR films. I've had nothing but positive experiences with the new Rollei 400 IR film in 4x5. I rate it at ISO 3 and use an 89B (r72) filter and it looks great. I also hear that it works well with a red 25 or 29, which will give more of the visible light effect (rather than IR).

 

[Markok765]

Kodak HIE is very IR.
So it Tech Pan, but you cant find it usually.

 

[fschifano]

In short, the more red response the film has, the more effect a red filter will have upon the image. Study the spectral response charts of the films you are considering; they should be published in the tech sheets for each company's product line.

 

[jim appleyard]

SFX will be backthere was a url link here which no longer exists).

If you enough light, a tripod and a bit of patience, using a #29 red filter with a polarizer can give you black skies without the strong foliage efeect.. It isn't IR, but unusual just the same.

 

[Flotsam]

I've gotten very nice results with Tri-X 400 and a #25. As mentioned, add a polarizer and you will get very dramatic results but even with Tri-X, you'd better have a tripod handy.

 

[Ole]

It seems to me that the Ilford "traditional" films (PanF+, FP4, HP5+) have a "better" red response than the equivalent films from the other major manufacturers. While SPX in 120 is returning soon, you might try FP4+ in the interim?

I've also been getting great results with Rollei/Maco IR 820/400 in 35mm. It can be a truly amazing film under the right circumstances.

 

[fidget]

Thanks for the update. If SFX will become available again then I will be a very happy camper, as they say near here. I will try the R29 filter, when I can get hold of one.

 

[Markok765]

Oh, Delta 3200 is near IR

 

[Fotohuis]

Rollei R3 has extended RED sensitivity. Till about 710nm then it's dropped quickly. It's a remarkable film for use with a red or dark red filter. It's available in 35mm, 120 roll film and sheet film (4x5"; 8x10" and even bigger).

Use this 3-layer cubic film with a depth developer and do not forget the pre-soak for this film.
Suggested developers:
AM74/Rollei High Speed 1+7 till 1+9
CG512/Rollei Low Speed 1+4
Rodinal 1+20/25
D76/ID11 stock for the lower iso rates only.

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The empty column is the Rodinal developer information which will be available very soon.....
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best regards,

Robert

 

[jim appleyard]

Thanks for the update. If SFX will become available again then I will be a very happy camper, as they say near here. I will try the R29 filter, when I can get hold of one.

Without the proper filter, SFX behaves much like an ordinary b/w film, even with a #29. For the full effect, I believe you'll want an R72 (?) or something similar.

 

[fidget]

Without the proper filter, SFX behaves much like an ordinary b/w film, even with a #29. For the full effect, I believe you'll want an R72 (?) or something similar.

Thanks for all your comments. They are very helpful. One of the advantages (for me) from SFX is that it is like any other film when used without filters. I think that the effect of the R25 filter is more marked than on other films I have tried, which is why I posted this question. Dave....

 

[Fotohuis]

If you want to look at a real I.R. effect you can use the SFX filter on each Infra Red film. Nearest equivalent is then the Rollei IR 820/400 film.
Comparing sensitivity and film curves the film is going slightly over the SFX but is not so sensitive as the Kodak HIE. Further the SFX and Rollei IR have an A.H. layer which the HIE has NOT.

Here some examples of the IR film and the SFX (Ilford) filter and the RG715nm (Heliopan) I.R. filter.
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Best regards,

Robert