So my testing has confirmed that with the 1:1 dilution of Diafine in a JOBO at Rotation P you need to extend your development time to 6 minutes in part A and part B and also run at a temp around 25 C. If you choose not to, you will find that films like 400TX die after about EI 800 (shadows get a bit too thin for me) which is about a stop lower than is expected with the Diafine/ 400TX combo. If you only want box speed to say 800 with 400TX then the standard 3 minutes in A and B is fine.
So today I ran a test to compare 1:1 and full strength Diafine also in a JOBO. Density as you would expect is a tad bit higher at the full strength but not by a lot… again I am extending the time to 6 min in A and 6 min in B. The contrast of the full strength is also a tad bit higher, but nothing a good scanner could not work with…. but the 1:1 is soooo nice.
My advice…. Diafine 1:1 at 25 C for 6 min in A and 6 min in B, rotation setting P. (Note: 1:1 with Diafine is a one shot developer!)
With regards to high speed films, Kodak TX400 works out to a usable E.I. range 1:1 (6 min A and B) from about 200/400-1600 with 3200 somewhat usable…. maybe! Ilford Delta 3200 is amazing with this developer and is nice from about 100/200 – 1600 with 3200 also quite usable in a pinch ( note: you have to love grain to love this film)! The now killed Kodak P3200 is still undergoing tests as it is still around in good supply and it looks like it will have a very solid 3200 but much more grain than the Ilford… which could be nice! I love grain!!
The Kodak 400TX has nice grain but wow the Ilford is just stunning…. The Ilford is only long term bet as of now – much lower contrast and very easy to scan across a wide range of EI. All the scans above are 100% crops from a very large 35mm scans at 3000 dpi on my Imacon Scanner (I decided not to do 6300 dpi on the scan just to save time and sharpening is off on the scanner, -120 setting).
Viva la Revolution- Stephen