Barry Thornton quote:
"The film is ’developed’ in Bath A with agitation every half or full minute -it’s not critical. Actually little development takes place. Mostly the film is becoming saturated with the developing solution. However, some development does take place and agitation is important to prevent streaking. The solution is then poured off and saved. Drain the tank well but don’t rinse or use a stop bath. Then pour in Bath B, and after a quick rap of the tank on a hard surface to dislodge any airbells, let the tank stand still with no agitation for three minutes or so when all development has ceased. Note, though, that while no agitation is ideal, and usually works well for unsprocketed roll film (120/220), there can be streamers from 35mm sprocket holes. This seems to vary with different kinds of tanks, different films, and the local water characteristics. Do your own experiments to determine the minimum agitation you can achieve without streaking before committing a crucial film to the process. Perhaps try one minute intervals to start with."
I'm using Kindermann stainless steel tanks with 120 and 35mm film.
I don't agitate Bath B,never had any kind of streaking.
Thank you, Wolfgang.
As I said, I have all of Thornton's material and am not having any problems with streaking. Just running test and looking for others' experiences using agitation and time to alter negative contrast.
I've had excellent results with this developer thus far, everything I've developed has been well within the range of printable, which is quite impressive to me in the first place. Just trying to get things really dialed in at this point.
May be it sounds silly. Just wondering, how much of Bath A and Bath B is used for one roll of 120 film?
Originally Posted by David Allen
I just fill it up. It is not like it get's diluted or thrown out.
Likewise-it's a very cheap and reliable developer IME.
I just placed an order for the chemicals. Hope I can spend some time during holidays.
The amount of developer you use is simply determined by how much developer is required to cover the film in the tank or tray that you are using.
For example, I use Paterson plastic developing tanks. These require 300ml to cover one reel of 35mm film, 600ml to cover two reels of 35mm film, 900ml to cover three reels of 35mm film, 500ml to cover one reel of medium format film and 1000ml to cover two reels of medium format film. The reason I have written 'reels' is that, with medium format film, you can load two medium format films into each reel.
Apart from having enough developer to cover the film, the only other consideration is exhaustion of Bath B (1L will easily be sufficient for 16 films).
What I always do is process 4 rolls of medium format film loaded in to two reels in a 1L Paterson tank using 1L of Bath A followed by 1L of Bath B.
Thank you very much. Hope things will go find with RPX 400.