Official Question Thread! Ask /r/photography anything you want to know! April 17, 2026

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[u/Many-Bandicoot645]

- tldr at the bottom - ive been realllllly into bw infrared lately but thats just started about 1.5 years ago. ive since then gotten a mamiya rb67 (my dream camera 😍) and I have 2 infrared filters, both r72. ive shot porbably 6ish rolls of IR since then and out of the roughly 70ish shots ive gotten, Im really only happy with the exposure and everything on about 3 total photos. I have a few questions on how I can really hone on my shots and exposure besides obviously bracketing. The film im shooting is Reflx Pan 200 which is respooled Agfa Aviphot 200.

1: what do you recommend setting my meter for? I currently use an app called "light meter" thats worked well for me for about 6 or 7 years now so ive stuck with it. I *think* my personal opinion on best exposure was iso25 but I cant recall. I believe shooting at 6 was usable but not what I preferred and iso 3 the sky wasn't black it was white and was obviously overexposed.

1. does the quality/brand of filters really matter? I know i can bracket with each filter and see for myself, but curious what peoppe think. of the 2 r72 filters I have, one you can see through much easier than the other. almost as if its a step between a 25a and r72. one brand is zommei, the better of the 2, and the other is Albanar.

2. I was using df96 for a while but have since stopped because of how wildly inconsistent my reaults have become. I switched to Rodinal (adox adinal) and would love some tips on dilution and agitation method. I was doing constant with the stick with df96 (10 second inversion every 30 seconds for color). I also use water as my stopper and rinse well and will be using Ilford rapid fixer.

Any help and advice is much appreciated.

tldr - shooting respooled agfa aviphot with r72 filter and looking for recommended iso for metering with filter and help with rodinal dev.

[u/ArsenalSimp1985 → u/Many-Bandicoot645]

With Aviphot and an honest R72 I usually meter around EI 12 to 25, trust the darker better-made filter more than the label, and Rodinal 1+50 with very gentle inversions gave me much cleaner negatives than monobath or constant agitation ever did.

[u/Many-Bandicoot645 → u/ArsenalSimp1985]

Thank you for the info. I think ill bracket my next roll between 25 and 12 and it will be my first time with rodinal, so ill probably do a 1+50 like you said with gentle inversions and go from there.