Streaks in the negs c41

[Sirius Glass]

Bob I have one concern about it. While using the jobo tank with the machine less developer is needed than when inverting manually. How manual inverting help to reach all the film's surface faster than the rotary machine while having less chemicals inside the tank.

I have never had a problem using the chemical volumes recommended on the Jobo tanks. When all else fails RTFM.

 

[Photo Engineer]

But then I use exactly what Jobo recommends and have never had streaks.

PE

 

[Sirius Glass]

I have always and I must stress always used 1litre of chemistry in a Jobo for each chemical... maybe more than others..

Jobo specifically recommends using more chemical volume than necessary because the added volume adds to the stress on the electric motor and can shorten the motor life. But much like being against freezing film, there are some who claim to know better than the manufacturer.

 

[Photo Engineer]

I've been thinking about DW vs tap water and streaks. I have no idea why they should differ unless it is the dissolved salts in most tap water.

PE

 

[Sirius Glass]

Some, but very few, tap water sources cause film processing problems. Many use distilled water in an abundance of caution.

 

[sfaber17]

I can see how you would need to do that manual inversion depending on what type of jobo you are using. If it doesn't have a lift, there would be too much delay before the drum starts spinning. If you have a CPP-2 with lift or an autolab, then the chemicals go in quickly while spinning fast, and you don't have a problem. Those also spin and reverse directions periodically.