Adox CMS 20 II @ISO 12, dev. in POTA developer
As some of you know, microfilm requires special developers to make it accessible for normal photography. The advantage of these films is the high resolution, so that even with 35 mm film you can reach the performance limits of the lenses.
I have now photographed some years with the microfilm ADOX CMS 20II. It can be developed in a special developer "Adotech" but also in Caffenol. The results are good, but you can still see the film's origin, because it reacts very sensitively to incorrect exposure and can get very steep then.
By chance I heard about the POTA developer, which is very simply composed: 1.5 g phenidone and 35 g sodium sulfite per 1 liter of water. That's all.
This developer was used to expose very large contrast ranges on film, from nuclear explosions to aerial photography to astrophotography. 15 to 20 f-stops contrast range can be compressed with it.
Pre-exposure of film with zone II
Exposure: ISO 12
Development in POTA: 20°C, semistand 13:30 minutes. The film has to be pre-watered to avoid streaks!
The developer only lasts for 1-2 hours and 250ml of self-made
developer cost less than 20 cent. Within this time you can develop as many films in it as you like.
Adox CMS 20 II @ISO 12, dev. in POTA developer
As some of you know, microfilm requires special developers to make it accessible for normal photography. The advantage of these films is the high resolution, so that even with 35 mm film you can reach the performance limits of the lenses.
I have now photographed some years with the microfilm ADOX CMS 20II. It can be developed in a special developer "Adotech" but also in Caffenol. The results are good, but you can still see the film's origin, because it reacts very sensitively to incorrect exposure and can get very steep then.
By chance I heard about the POTA developer, which is very simply composed: 1.5 g phenidone and 35 g sodium sulfite per 1 liter of water. That's all.
This developer was used to expose very large contrast ranges on film, from nuclear explosions to aerial photography to astrophotography. 15 to 20 f-stops contrast range can be compressed with it.
Pre-exposure of film with zone II
Exposure: ISO 12
Development in POTA: 20°C, semistand 13:30 minutes. The film has to be pre-watered to avoid streaks!
The developer only lasts for 1-2 hours and 250ml of self-made
developer cost less than 20 cent. Within this time you can develop as many films in it as you like.