Over the years I've used EFKE 25 in ID-11 (D76), Adox Borax MQ (FR 2), Xtol and these days Pyrocat HD. See the EFKE datasheet for these films (old DIN names) but aside from slightly better hardening the films haven't changed:
Originally Posted by DREW WILEY
Yes, at one point in the UK these EFKE films were packaged as Jessops own house brand B&W films and sold as 50, 100 & 200 EI emulsions
Originally Posted by pdeeh
Jessops 50 = EFKE 25 (old 14)
Jessops 100 = EFKE 50 (old 17)
Jessops 200 = EFKE 100 (old 21)
This is the data for Jessops R50 (EFKE 25):
So as you can see EFKE recommended 100 ASA (EI) in FR24 developer with KB/R14 (now called KB/R25), however FR E24 was a speed enhancing developer like ID68/Microphen, and the lower speed 40 ASA (EI) was in FR 5 a fine grain metol based developer which gave a slight drop in film speed compared to ID-11/D76. So taking that into consideration it's no coincidence that Jessops were selling EFKE 25 packaged as a 50 EI emulsion.
I did my own speed tests back in the 1970's with KB14 and although I've switched to Pyrocat HD I still expose at the same EI, I mainly use PL25 in my Agfa Ansco 10x8.
Drew, I mainly used TMax100 before I switched to Pyrocat HD, and with some films I've found a staining developer gives me a slightly higher effective speed compared to Xtol, so I'm shooting Delta 100 & 400, also HP5 at box speed. Tmax films have been revised since I stopped using them (due to lack of availability).
Last edited by Ian Grant; 03-19-2013 at 05:47 AM. Click to view previous post history.
Reason: add & correct