I thought Efke 25 and 50 were ortho-panchromatic, in other words reduced red sensitivity.
Fotoimpex have some info
http://www.adox.de/ADOX_Filme/ADOX_CHS_Filme/ADOX_CHS_25 /ADOX_CHS_25.html
Its in German which I don't speak but the end of the first paragraph seems to suggest reduced red sensitivity...
I ran some informal tests of this a while ago. I shot the same scene with objects of various colors, including a red frisbee, with several films, in the same light and from the same angle. The Efke 25 did produce a darker result than most other films, but this effect was dwarfed compared to the results of Tasma MZ-3L, which produced something that looked completely black for the frisbee. Your brickwork example, by comparison, is dark gray (except for a few areas in deep shadow). Unfortunately, I don't have scans of my test scenes handy to show for comparison.
I suppose another way to test to see if a film is orthochromatic is to expose it to a red safelight and see if it fogs. I can't say that I've tried this particular test with any film, though.
Oh, and I just went Googling, and found this page with spectral sensitivity graphs for Efke's 25 and 50 products. These shows sensitivity clearly into the red region, although without any comparison graphs for other products it's hard to draw conclusions.
The developer was replenished each morning by bring the total up to a line with D-25.
The charts linked to above indicate quite otherwise. Pretty typical of panchromatic films.
Having recently taken a number of photos on a c.1935 Agfa folder with modern film I'd say the lens plays a great part. (The film itself could well play a part also, but you can easily see a different look with the lens the only factor).
Absolutely. If you load that folder with Efke film, and process in Rodinal or ATM49, you'll notice an even greater difference.
Rolleijoe, which Efke film do you suggest and what dilution of Rodinal should be used please?
Sam H.
Sorry, Rolleijoe, I forgot to mention that I use 35mm negs, where the grain is very important thing. Using EFKE films and Rodinal with 35mm is bad idea, even 8x10'' prints show HUGE grain. But I'm completely agree with 4x5 negs, where this is not so visible.
BTW, if you want to make ortho film without red sensitivity, it maybe a good idea to put it into pinacryptol yellow solution before exposure and then dry. This will desensitize it in the red range. Ofcourse it may shift the whole ISO and spectral sensitivity - a question of experiments.
Anyway - who tries will get his own right result. There are a lot of ways to go.
Uhner, I saw the message befor it was deleted, but:
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