Issues with exposures in bright light

Do you think it is an exposure problem unrelated to bright light exposure or a problem with the roto processing? My guess would be with the roto processing?

 

It's nought to do with the exposure, it's a process problem.

Can't help furtheras all my tanks are inversion type

Ian

 

had to look up "Orthogonal" and the meaning was interesting "Not pertinent to the matter under consideration"

Actually it looks as though the reel with the sheets of film isn't rotating properly causing the banding, could be slipping.

Ian

 

My thoughts too.

Steve

 

Six sheets in a 2509 reel can sometimes be two sheets too many if your film base isn't stiff enough to prevent the sheets from touching when wet. Were they stuck together when you pulled them out? One to the inside+ middle slot empty+ one to the outside might cure this.

 

I love that word and use it often. But, then again, 4 out of 5 statisticians do also!

 

If you are using the slow speed, try it on fast, which is Jobo's current recommendation.

That took care of the uneveness problems I was having, but I didn't get patterns extending across the whole neg. as you've shown.

If you don't mind using around a liter of chemistry, you could try a few sheets using inversion.

 

The repeating of the problem across the film would suggest to me it is not the camera but the processing. Don't have an answer but I stay away from 6 4X5 sheets in the Jobo, 4 max and I don't use the wings.

 

Orthogonal can also mean "at 90 degrees to". A more general definition would be "does not correlate with". Anyway.

My only guess as to the problem at hand is that if it's not slipping in the drum, it could be a standing wave in your tank, i.e. due to the way the developer flows over the film, you might get ripples and/or some parts of the film might get more agitation. I don't do LF myself though so don't really know. I wouldn't expect it to be film stuck together - I've done that accidentally while putting 2 rolls of 120 in a spiral and not pushing the first one in far enough - one of the films will come out completely undeveloped and the other with an undissolved milky backing that requires a re-fix.

 

Ulrich, it is possible that with you using precisely 560ml of solution, you are just covering your inner films.

I use the 2523 tank with 1 reel and four films, Jobo say 270ml, trust me when I say this just covers the sheets with a very small margin for error.

Is your processor dead flat?

Is your solution quantity exactly 560ml, or is it a tiny bit under?

If either of these are not exact, then you haven't allowed enough room for error. Jobo do seem to give very little room for error, which is fine, but one has to be careful.

I use 300ml instead of 370ml with my smaller tank, with your tank I would use 600ml.

Looking carefully at the sample you have shown, those lines really look like wave lines. I'm purely guessing here, but it seems to me that it may be possible that the developer solution is just breaking over the inner films and it is running over in small waves.

I'm not familiar with the 2509 reels with the wings, my reel doesn't have any wings as they weren't invented when I bought my reel and tank.

Do you think it is possible that the wings may be just causing enough surface turbulence, to create small waves?

When I first started rotary processing I was unsure of just how close the Jobo solution requirements were to either be dead correct, slightly under, or slightly over.

I measured water to the correct solution capacity stated, very carefully, placed the reels(s) in the tanks without film, poured the water in whilst the tank was in the inversion position. Then I covered the top of the tank with a clear cling film (Klarsichtfolie?). Then I placed the tank on its side on a checked level surface.

The results were interesting, basically there is no room for error.

From then on I generally have always gone up slightly with solution quantity, especially with the first bath as the tank is bone dry and there is no used solution from the previous bath remaining.

Using a Jobo lift as I do, there is dependent upon the tank type and size, different amounts of carry over solution. From about 14ml to 25ml on the bigger tanks. This amount by the way, is pretty close to the leeway you have with solution capacities in Jobo tanks, in my experience.

Mick.

 

I hope you can salvage these, because I think that is an outstanding picture.

 

Jobo also recommends a 5 minute presoak last I heard, in part to make times more similar to small tank inversion processing, but also to make development more even.

Lee

 

For inversion use, you would fill the tank and use it in the same manner as a roll film tank, and not in the Jobo. It takes a lot of chemistry, but it works just fine, there is no problem in the developer mixing.

 

My understanding was that emulsion side should always face the center core of the reel, and film base should face outward. Hope you've found the solution. Very likely the case if the pattern matches the tank

Ribs might be a better English term than fillets.

Lee

 

This problem is the road rut problem Elevator experienced for awhile with Jobo tanks.
We solved this problem by manually inverting the Jobo tanks in the first 20 seconds after developer was added.
then slap onto the Jobo and rotate.
The minus density is the clue which gives darkness on the positive image.
This problem almost singlehandely closed our film production for one month until we solved the problem

Agitation at starting stage of development with a twist is the answer we found.

 

Mmmmmm..... Ribs... :munch: