Infra-red with the RealitySoSubtle 4×5

Yesterday evening I went to Nantes in order to try out some infra-red pinhole with the 4×5 pinhole camera. The film used here is Rollei IR400, and the filter used is the Hoya R72.

Thank you Jacob Klee for finding and sharing the perfect ASA (with the R72 filter) and reciprocity characteristics for this film….which are as follows:

Note: I was using the ‘Pinhole assist’ app on the iphone to meter and the “Reciprocity+” app to compensate the metered time.


1: Meter at ASA3 (using pinhole assist app with the applicable “f number” set),

2. Enter metered time into “Reciprocity+” app using the “Tri-x – plus x125”  reciprocity setting (which I copied and renamed Rollei IR400).

This exposure ( of the beautiful Lu tower in Nantes) was 5 minutes..

Lu Tower



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  1. Rachelle M June 28, 2015 at 3:38 pm #

    Great work James! I want to try infrared in my 6×17 RSS but I just need the time (and the sun) to do it!

    • admin June 28, 2015 at 6:29 pm #

      Me too! I going to order some Rollei IR400 in 120 pretty soon. Exposures will be in the region of 7 mins in full sun. Time enough to work on your tan!

  2. Urban Hafner June 29, 2015 at 7:36 pm #

    Very nice James! But may I ask what is the reason to use Reciprocity Plus instead of the reciprocity support built into Pinhole Assist? Is it somehow better?

    • admin June 29, 2015 at 9:43 pm #

      Ha! Because I didn’t know that it was possible! Thanks, simpler to use the one app for everything!!

  3. Colby July 12, 2015 at 11:08 pm #

    How did you secure the filter to the 4×5?

    • admin July 13, 2015 at 1:21 pm #

      Hi, just a couple of pieces of black tape. As the camera uses film holders you can re-position the filter in between shots.

  4. Henry Thomas July 16, 2015 at 9:18 pm #

    Nice. I will include that information in the next release of Pinhole Assist !Super shot, by the way. You took it from the gangway going over the railway ?

    • admin July 16, 2015 at 10:51 pm #

      Yes, from there exactly! It’s a great app…it’d be awesome if every film was covered.

  5. Monika D November 7, 2017 at 5:47 am #

    This is very helpful for some IR experiments that I want to try with my 6×6.

    I’m curious to know why you chose the “Tri-x – plus x125” RF curve. Have you found this setting to be consistently “correct”? (Or at least ballpark.)

    • admin November 10, 2017 at 9:16 am #

      Hi Monika,
      Yeah at the time I did a little digging and found (somewhere – I can’t remember!) that that curve would work well with the Rollei IR400. I think it will work well for you with the 6×6.

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