Efke 100 again

micha · 2004-06-10T07:05:40+00:00

Ich bin gerade von F09 auf Rodinal umgeschwenkt worden. Nun habe ich den Efke 100 mit 25" bei 1:80 in F09 entwickelt. So nun die Frage: Irgendwie sollen ja d...

micha

I’ve just switched from F09 to Rodinal. I’ve developed the Efke 100 at 25" at a dilution of 1:80 in F09. So here’s my question: apparently, the two developers are somehow related. With Calbe, it’s 1:40 = factor 1, 1:80 = factor 2. What about Rodinal: 1:25 = factor 1 and 1:50 = factor? And what about 1:100 = factor? I tend to be more interested in higher dilutions. Unfortunately, I can’t find any times for the Efke films in your table. I know I could test it myself, but I don’t have the patience or time for it right now. I developed the Efke 25 yesterday at 11" 1:100. It looks quite decent. But what about Efka 50 and Efke 100 at 1:50 or 1:100? Thanks Micha

MirkoBoeddecker

Hi Micha, Who was it that got you to switch to Rodinal? One of us? We’ve got plenty of R09 in stock; it’s just the F09 that’s currently out of stock, but they’re both identical. Rodinal is NOT identical. Rodinal is based on the original Rodinal, the R09, but it’s been modified time and again. Very roughly speaking, you could say Rodinal 1+50 = F09 1+40 (or 1+100 = 1+80, and so on). The dilution factors are also listed on the F09 bottle. So if time X applies to 1+40, then for 1+80 it’s time X multiplied by the dilution factor for 1+80. To ‘switch’ from F09 to Rodinal, use 1+100 with the same development time. Best regards, Mirko

micha

Fine, fine, but is that really the case??? With the F09, I ended up testing the EFKE 25 at 18" at 1:80. But with Rodinal 1:100, it’s only 10+11"... The EFKE 50 at 1:50 for 10" is probably a tad too hard. Doesn’t anyone try this out? How can I tell with a scanner whether my negative is too hard or too soft? I should be able to read that from the histogram, shouldn’t I? So if the histogram goes from 0 to 255 and there’s a nice hump in the middle, that’s OK, right? But if the first peaks don’t appear until 80?... Micha

uworischki

I can only recommend the development times for the Efke R50 in F09: at 1:100, it takes about 20 minutes. By the way, Mirko, I’ve still got an R09 or F09 bottle where the Efke 100 is listed as taking 6–7 minutes at 1:40 – that never works... Uwe