So in case you missed the hysteria: Kodak is no longer going to make acetate which is a base material for most roll films… HOWEVER!! this does not mean the end of film for Kodak. Kodak reportedly has several years worth of material on hand, their sheet films are on ESTAR base material- which they still produce- and they are looking for additional vendors to fill their acetate needs when their supply runs does out… again not for several years. This is really not as big a deal as some would suggest. Other sources of acetate exist- there will be a lot more news like this in the coming years from all current film makers, so we as film shooters need to take it in stride and not freak out – yet! For now just go shoot some freaking film!
So currently in my JOBO CPP2 I am running Diafine full strength Part A and full strength Part B for 5 minutes for all BW films at rotation setting “F” which is around 40 rpm. After part B I increase the rotation to “P” which is around 80 rpm and keep it at that for the remainder of the process. My tests have shown that times around 7+ minutes in A/B can stain some films- yet 5 minutes in A/B at 75F seems about spot on to me and perfect for most scanning applications. The 1:1 development of Diafine decreases the shadow detail at higher EI… for example at 1:1 TX dies after about EI 800 whereas with the full strength process as outlined above EI 1600+ is very solid (note: box speed at 1:1 is about perfect- for box speed). With regards to streaking…. none, full strength or 1:1. An obvious advantage to full strength is that Diafine can be used over and over again for a lot of film where as the 1:1 is a one shot developer. I have personally used Diafine (1 gal A/B) full strength for well over a year without issue…. if it becomes a bit dirty just run it through a new clean coffee filter and presto! Perfect developer ready for more film.
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).