Rollei IR 400 in Rodinal ?

morrishilarian

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You've got a great shot there WJ. So you push 5 stops to 12 ISO, I'd try that and bracketing too. Can't wait Never tried IR before. I hope my first try would turn out ok.
 

mrred

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My first attempt was with SFX200 and souped in WD2D+. R72 with 4 stops compensation. Someone mentioned that I should take a "normal" shot on the strip to tell if I had the development correct, and it was. I expected a disaster that just didn't happen.

In this shot, I am standing on a walk bridge over a stream and the hot summer sun is at high noon. It was a nice effect on leaves, as the shaded ones were left dark.

 

mrred

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It was over exposed, as recommended for my Cokin 007 (r72) filter. Using a pyro gave me a large safety margin for exposure as well.
 

morrishilarian

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So I better shoot Rollei IR 400 at 25 ISO? I'm gonna try with a generic IR filter first I've been spending so much lately.
 

Q.G.

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Also mind that the sensitivity drops fairly rapidly at wavelengths longer than 700 - 720 nm.

Using an 88A filter (main transmission at 715 nm) is already pushing the boundaries, which is why that extra stop is needed. A 89B (main transmission just below 700 nm) would be better.

A "generic" IR-filter, as was suggested earlier, may well have its main transmission in a region the Rollei film doesn't register. An 87 filter, for instance, begins to transmit where the Rollei film is already 'shutting down'.

So choose your filters wisely.
 

RobertV

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Well in practice you will have the best results with the Heliopan RG715 and Hoya R72 filters. The RG695 (Heliopan) or Cokin 007 IR is possible but less IR wood effect.

Interesting is that Heliopan is still available in Bay fittings too.
 

morrishilarian

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lol. i wasn't aware of those u guys mentioned above. i'm really new in analog. 3 months. roughly though. still waiting for my generic IR for experiment. 760nm. if i did a wrong move, please advise maybe i will try shooting SFX 200 too. how do i know the filter has how many stops?
 

MattKing

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morrishilarian:

If you already have a 760nm filter, you may as well try a few experiments with it to go alongside shots taken with a 720nm filter.

Try shooting with the sun at it's brightest, and bracket your exposure around a 5 to 8 stop filter factor. The film has very little sensitivity at that wavelength, but you may get some response.

In Malaysia, you might have a little bit more IR than thefizz gets to enjoy in Ireland
 

2F/2F

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The 760 nM filter will work with Rollei film (which is sensitive to 820 nM), but it will require more exposure to be made than the filters that cut off at lower wavelengths. This filter is a visually opaque filter, passing no visible light, in theory. However, it is a rare filter that cuts off exactly at a certain wavelength; there is usually some slop to either side of the stated cutoff. The R72 and filters similar to it pass some visible light, which you can see if you look through the lens at something that is reflecting a lot of deep red light.
 

DWThomas

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I was able to use the Rollei material with a 760 nm filter but I wound up adding about 12 or 13 stops to the incident readings I took at ISO 400. The "Thun Trail Crossing" shot in my gallery images was taken that way. I was down around a 6 or 7 stop adjustment when using a 720 nm. (And somewhere I read an 89B is 695 nm.) I still think the 760 gives a slightly better "infrared look" for my taste (or lack thereof) but I did have better results with my latest try with the 720, I suspect a lot depends on peculiarities of the lighting in a specific scene. (Bracket, bracket, bracket ...!)

There's some additional blather and examples of the Rollei and the Efke stuff in my PBase Gallery. All was developed in HC110, 1+31, or more recently, 1+47.
 

Q.G.

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Rollei IR 400 may be sensitive upto 810 nm, but the sensitivity is just about nothing at that wavelength. At 750 nm, sensitivity is seriously reduced already. Hence the need for many extra stops of exposure.

So the IR 'window' (the range odf the spectrum between visible red and where the film is no longer recording anything) that can be used is small, and filters need to be chosen carefully.
Given the characteristics of the film, a 695 nm or 710 nm filter would appear best. For a 'deeper' IR effect, we would need another film.
 

morrishilarian

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Thanks to all. I'd sure open this thread as guide as soon as I get my filter.

In Malaysia, you might have a little bit more IR than thefizz gets to enjoy in Ireland
Click to expand...
How did you know that?

Well, I came across with the Ilford SFX 200 too. Do you guys think it will work with my generic 760nm filter? I need to expose longer perhaps. (I should have bought the 720nm filter )
 

thefizz

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Unfortunately you will have even less success with the SFX film and the 760nm filter as this film's sensitivity peaks at 720nm and only extends to around 740nm. I don't think any amount of Malaysian sunlight will get you through this one
 

tokengirl

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I have been using a B+W #092 filter with Rollei IR 400 (description here). Exposing at ISO 12 in bright Florida sun, developing in Rodinal 1:50 for 12 minutes at 20°. Pretty contrasty, but I'm happy with the results.





 

morrishilarian

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Hello again guys. I've just received both IR filters, 720 and 760. I'm going to order Ilford SFX 200 soon. I couldn't find Ilford SFX 200 thread (if there's any). So basically I need advice on the exposure/shutter speed. Please advise. Thanks in advance!
 

mrred

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Use the 720, expose as EI 12 (4 stops over exposure) and develop for EI 200. How much you have to front focus, depends on your lens.
 
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