Archived posting to the Leica Users Group, 1999/02/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Luggers and Luggerettes, I know some of you are thinking of buying a Jobo processor...so here are some test results with my machine. Bear in mind that I own the DuoLab which is a bit different from the CPE2 and CPP2 in that the DuoLab is a continuous one sided revolution process. The other Jobo processors intermittently turn on one side and then turn the other way. Well, I always had some contrasty results with my black and white process. The E6-3baths gives consistently great results with process times as prescribed by the developer documentation but with B&W I always had lots of contrast even with XTOL process times for rotary processors published in Kodak's XTOL documentation. After a phone call to Jobo, they told me to do a 5 minutes pre-wash with distilled water and then proceed with the published times (hand inversion) as a starting point. Well, I tested this with 2 test rolls of each: TriX/XTOL, PlusX/XTOL, Delta100/Ultrafin Plus, Delta 400/Ultrafin Plus, TMax100/TMax Dev and HP5/UltraFin Plus at published rated speeds. I timed the process at hand inversion published times (adjusted for 75 degrees F -according to Ilford's temp conversion table found in their Product Data Guide Cat# 16794- because I temper all my B&W chemistries at that temperature) - 5%. As an example: Delta 100 with UltraFin Plus 5 minutes distilled water pre-wash at tempered at 75 degrees 4:30 minutes developing at 75 degrees (published minutes adjusted to 5 minutes (from 68 degrees to 75 degrees) -5%=4:45 minutes - 15 seconds emptying time) 30 seconds distilled water tempered at 75 degrees for stopping purpose 4:15 minutes fixing (4:30 minutes - 15 seconds emptying time) at 75 degrees 1 minute washing tap water 1 minute HypoClear 1 minute final wash tap water 1 minute Kodak PhotoFlo at room temperature Dry I am very happy with the results. The negatives show quite normal contrast and usual sharpness/tone per film type. Just thought I would share this with you. Francois Brunelle Ashburn VA