B&W film developing problems with Jobo CPA-2

[timpppa]

Hello!

I bought a second hand Jobo CPA-2 and I just developed my first
b&w roll with it. Can anyone say why the negatives contain brighter
areas, as in this example Dead Link Removed

I bought the jobo for color development mainly, but I tried it
with b&w first.

...and don't mind about the dust...

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TIA,
timppa

 

[Amund]

From the scan it looks like overdevelopment, did you adjust your times for Jobo processing? And did you check the temerature with a thermometer?

 

[RalphLambrecht]

I don't know what this is (looks like 35m sprocket holes), but it has nothing to do with Jobo developing.

 

[doc4x5]

Looks like underexposure and overdevelopment since there's little detail in the shadows but without a lot more infor than you give, it's a bit hard to be certain. If by "brighter areas," you mean the highlights, I think you've over developed. A subject such as you have chosen is less than ideal to judge issues of evenness of development.

Eric

 

[doc4x5]

Oops, I re-looked and if you're referring to what looks like 35mm sprocket holes, as the previous poster suggested, I agree that it's unlikely to be related to the jobo unless the reel was loaded improperly and one area of film was in direct physical contact with another.

Eric

 

[Amund]

Do`h, didn`t even see the sprocet holes

 

[nworth]

The light spots do look like sproket holes. If this only happened on just a few frames, particularly if they were near the end, I suspect a very small light leak, either while loading or unloading the camera or while loading the tank. It might be an overzealous luminous marker on some equipment. If it is consistent throughout the roll, I have no idea. Notice that the spots are a bit lighter (greater negative density) and a bit less contrasty than the rest of the scene, like the film was flashed through sprocket holes. (It could also be a scanner artifact. Check the negatives to be sure the splotches are real.)

As for the other problems, the picture is just a little contrasty. You can probably correct that by slowing down the drum rotation to the "F" mark. If you're already there, just shorten the development a tad. Color is less fussy about that kind of thing than black and white, and I have had no problem using fairly vigorous agitation while processing color film.

 

[timpppa]

The light spots do look like sproket holes. If this only happened on just a few frames, particularly if they were near the end, I suspect a very small light leak, either while loading or unloading the camera or while loading the tank. It might be an overzealous luminous marker on some equipment. If it is consistent throughout the roll, I have no idea. Notice that the spots are a bit lighter (greater negative density) and a bit less contrasty than the rest of the scene, like the film was flashed through sprocket holes. (It could also be a scanner artifact. Check the negatives to be sure the splotches are real.)

They are sprocket holes which show in the picture as brighter areas,
but they were only at the beginning of the film. I think it might be a cause
from light leak...

As for the process it self, I use Ilford Delta 100 film.
Ilfosol S as developer, IlfoStop as stopper and Ilford rapid fixer as the fixer.
Development time was 10min, and rotation speed dialed to P.
Temperature was 20°C

I think I'll have to make a test roll and develop it tonight.

As for the other problems, the picture is just a little contrasty. You can probably correct that by slowing down the drum rotation to the "F" mark. If you're already there, just shorten the development a tad. Color is less fussy about that kind of thing than black and white, and I have had no problem using fairly vigorous agitation while processing color film.

Thanks for the advice!

--
- timppa

 

[timpppa]

Hello!

What are the times you are using for the Ilford Delta 100 film with jobo?
I've never had any troubles with manual work... I'm getting better
results but I would appreciate if you would share the info.

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- timppa