Adox HR-50 and PanF in PMK Pyro

The launch of Leica Monopan 50 prompted me to buy the Adox HR-50 (the same film) and give it a try. Recommended ASA and developing time in PMK is not given so I decided to expose at a third of a stop below 50asa and develop for 9min at 21deg – the recommendations for PanF, so I also decided to expose a roll of the latter and develop together with the HR-50. Both exposure and developing times appeared to be satisfactory but see the comments below regarding highlights. Note that Adox (typical of all their film) recommend their own special developer for this film.

The Adox is on a PET base and can (and did) lead to some light piping (see CHS II) when loading in bright sunlight but led to the loss of only the first frame, other stray light affecting only the rebates. If that frame had not been affected I would have got 38 frames from that film and 39 frames from another roll of HR-50, and 38 from the PanF. I did notice that when the sun was in the frame or close to the edge then light bleeding appeared to affect a larger area of the image with the HR-50 than on traditional films.

I shot all films in a Leica MP with a Zeiss 35mm C-Biogon lens.

It’s not clear what the Adox film is based on (Adox themselves say it is “based on an emulsion commonly available for technical purposes”) – I’m guessing an Agfa copyfilm. Adox have applied their own “speed boost” technology which I’m guessing is pre-flashing – I can’t think of a chemical process that could be used on a ready made film to increase speed. If anyone knows the actual film or process used please enlighten me. Several of the images show a loss of highlight detail – a problem associated with pre-flashing – so I’ll need to be careful about highlights in the image in future. Adox’s own developer may address this problem – I have some so when I get round to using more film with their developer I’ll report back! Omar Tibi claims it’s based on Aviphot 80 which may be the case but then 80asa + “speed boost” technology = 50asa ???? doesn’t seem to make sense. Omar also claims that the highlights are well controlled which I did not find although PMK is very good at controlling highlights. On the other hand Omar’s claim could explain the highlight problem and perhaps Adox’s own developer slows the highlight development. But I think I’ll stick with the copyfilm theory.

Incidentally on great enlargement grain for both films is very similar and minimal. I do very much like the tonal rendition of HR-50 in the low and mid-tones, more so than for the PanF, something that surprised me.

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