JOBO 2500 4X5 sheet film processing tankgreenspun.com : LUSENET : Large format photography : One Thread
Hi everybody. is anybody have experience on jobo 2500 4x5 single reel tank and processing by hand. in small tank kodak recommended agitation at 30 second intervals. i would like to know the agitation for the jobo 4x5 processing tank.i also have problem with the developing time.(i used T-max 100 film and x-tol developer 1:1). thank for the response.
-- john lin (email@example.com), November 18, 2000
You can try the 2551 tank and a motorized roller base, it makes life a bit easier, if you want to do multiformat developing. If you want to do solely 4x5 try the expert drums.
-- Altaf Shaikh (firstname.lastname@example.org), November 18, 2000.
If you get Kodak's publication on XTOL, it specifically gives developing times for rotary processors for several different types of film (including non-Kodak), different temperatures, dilutions and exposure indices. It's the most thorough data sheet they have. Of course, ultimately, you will want to do testing to establish your own development times, but Kodak gives you some reasonable starting points.
You are ROLLING the drum by hand, right? I don't think that drum and reel combination are intended for inversion processing.
-- John H. Henderson (email@example.com), November 20, 2000.
I have been using the Jobo drum you asked about for about one and a half years. It is a pleasure to use compared to trays or other daylight tanks I have tried. I simply put it on the Jobo hand roller (about $25.00) and smoothly roll it forward for a count of 20 and then the opposite direction for a count of twenty. The tank is not designed for inversion developing. However, I do use it as an inversion tank for compensating development (n-3 or n-4) because the developer is too dilute for the normal small amounts of solution you need for rotating development. I fill the tank up when doing compensating development.
Developing times a tricky. The only thing I can suggest is go to the Kodak website and use their times for rotary prroessing as a start. I don't use XTOL or I would give you mine. I use HC110 (dilution B) at 68 F and 8 minutes for tmax 100 normal development. I use Tmax RS for compensating development.
Good Luck Paul
-- Paul Mongillo (firstname.lastname@example.org), November 20, 2000.
After taking a workshop with Steve Anchell (Darkroom Cookbook fame), I purchased the 2500 tank to process 4x5 sheets. I process 4 sheets at a time, and fill the tank up to almost capacity. I agitate it for the first minute, then 10 seconds each minute thereafter.
I gave up on T-Max after too many developing problems, and switched to Delta.
-- Tony Pulsone (email@example.com), November 20, 2000.
Tony, I assumed you invert the tank for agitiation using Jobo 2500? (because you fill the tank).
-- Hisun Wong (firstname.lastname@example.org), November 22, 2000.
I hand invert my jobo 2500 series tank, just as I would a smaller stainless steel tank for 35mm and MF.
Sorry for the delay, went away for Turkey day.
-- Tony (email@example.com), November 28, 2000.