I do not have reference to the Tingsley book, but I've been compounding photo chemistry for my own use for more than 35 years, both B&W, color negative and slide. I cannot identify any reason to pre-wash B&W film for 5 minutes, whether processed in a small tank, Jobo, or other rotary system. The sole purpose of a pre-wash is to warn the tank and film to a high processing temperature so developer is not unreasonably cooled when first introduced into an otherwise cold tank. That issue normally doesn't exist for B&W processing at around room temperature. In a Jobo processor where the tank and chemistry are pre-warmed to process temperature, a pre-wash should never be required. Ilford recommends against a pre-wash when developing their films as they claim in introduces uneven development. I've no opinion on that, but they should know. There are a lot of YT videos out there which recommend a B&W pre-wash to remove anti-halation dye before development, which is a pointless waste of time and effort.
In the book it mentions that due to the added rotation of the tank and chemistry a prewash helps minimize the issues that can arrive from that movement. So far I have been happy with all my negs (10 years with a Jobo).
If you dig around, you'll find some posts indicating that the recommendation to pre-wash is Jobo-specific, and that an Ilford rep ultimately agreed with it for Jobo users.
Thank you for your answer. And yes its pronounced TOM. Here, NZ and Canada the familiar for Thomas is Thom. My 8x10 Intrepid is here, my 5x7 Intrepid with extra 4x5 back is in the mail BUT winter here is days and days of lousy weather so I get to admire both till spring.
I learned the 5-minute presoak for Jobos, as well. That's what my teacher told me, and he was a brilliant teacher in the darkroom and a phenomenal printer.
Same here, 5 minutes always. Having owned Jobos for since the 90s, I’ve always stuck with the 5 min pre-soak they recommended. Much debated over the years, but from experience, it does get you closer to published times for small tank with some fine tuning after.
@@CertainExposures as a 26 year old someone who just started shooting 3 or so years ago and has delved deep into film, processing, and now printing I am finding a many people around my age who have been fortunate enough to be mentored by masters and my hope is beginning to be revitalized in terms of where knowledge and even innovation will go in film photography. Just this year within 3 miles of where I live in Brooklyn NY, at least 4 film labs owned by young people have opened and are getting good business. I’m here because I’m now going to start developing all the black and white for my friends color only lab down the street in a jobo cpe2. There’s a fully equipped color darkroom a 10 min bike ride away from me owned by someone who worked with a master printer for several years and the majority of the clientele are people in their teens-late twenties- many of whom are now shooting editorials etc. there is hope
The kitchen setup looks nice and clean 🧼
I wash the dishes every day!
I do not have reference to the Tingsley book, but I've been compounding photo chemistry for my own use for more than 35 years, both B&W, color negative and slide. I cannot identify any reason to pre-wash B&W film for 5 minutes, whether processed in a small tank, Jobo, or other rotary system. The sole purpose of a pre-wash is to warn the tank and film to a high processing temperature so developer is not unreasonably cooled when first introduced into an otherwise cold tank. That issue normally doesn't exist for B&W processing at around room temperature. In a Jobo processor where the tank and chemistry are pre-warmed to process temperature, a pre-wash should never be required. Ilford recommends against a pre-wash when developing their films as they claim in introduces uneven development. I've no opinion on that, but they should know. There are a lot of YT videos out there which recommend a B&W pre-wash to remove anti-halation dye before development, which is a pointless waste of time and effort.
In the book it mentions that due to the added rotation of the tank and chemistry a prewash helps minimize the issues that can arrive from that movement. So far I have been happy with all my negs (10 years with a Jobo).
If you dig around, you'll find some posts indicating that the recommendation to pre-wash is Jobo-specific, and that an Ilford rep ultimately agreed with it for Jobo users.
A much debated subject over the years. Ultimately, do what works for you.
Thank you for your answer. And yes its pronounced TOM. Here, NZ and Canada the familiar for Thomas is Thom. My 8x10 Intrepid is here, my 5x7 Intrepid with extra 4x5 back is in the mail BUT winter here is days and days of lousy weather so I get to admire both till spring.
I learned the 5-minute presoak for Jobos, as well. That's what my teacher told me, and he was a brilliant teacher in the darkroom and a phenomenal printer.
Jamie Maldonado Lots of film knowledge will be lost in the next two generations
Same here, 5 minutes always. Having owned Jobos for since the 90s, I’ve always stuck with the 5 min pre-soak they recommended. Much debated over the years, but from experience, it does get you closer to published times for small tank with some fine tuning after.
Jobo’s 2020 catalog recommends a pre-wash for color film. Download it and you can read their reason for it.
@@CertainExposures as a 26 year old someone who just started shooting 3 or so years ago and has delved deep into film, processing, and now printing I am finding a many people around my age who have been fortunate enough to be mentored by masters and my hope is beginning to be revitalized in terms of where knowledge and even innovation will go in film photography. Just this year within 3 miles of where I live in Brooklyn NY, at least 4 film labs owned by young people have opened and are getting good business. I’m here because I’m now going to start developing all the black and white for my friends color only lab down the street in a jobo cpe2. There’s a fully equipped color darkroom a 10 min bike ride away from me owned by someone who worked with a master printer for several years and the majority of the clientele are people in their teens-late twenties- many of whom are now shooting editorials etc. there is hope
Interesting that the book you endorsed has gone up in price to $100. Guess I'll check out the library
Damn, when its at 1000$ I might sell mine ;)
The Nikon kept wobbling back and forth. Table shakes too much under your elbow :-)
Derek Konigsberg he needs to slap a RB67 on there as counterweight
Next time I shall put it on a tripod, its probably the new Ikea rug under thats extra puffy.
Jobo specifically recommends NOT doing a presoak when doing C-41, it's in their manuals.
Thats what I mentioned, that I dont presoak C-41.
Just got a free CPE2 and an feeling my way onto this system. Any videos most welcome