My CPE2 (no lift) does. It rotates fully then a mechanical switch gets tripped, then it rotates in the opposite direction. There's no option - it's fully built-in. Of course, there are other Jobo machines.
The impact of sprocket holes is mysterious. There is one other possibility. The HC110 is a syrup, right? And if your dilution was not mixed well enough, a concentrated amount may have surged through the sprocket holes when you filled the tank. Obviously not a significantly concentrated amount, but enough to have that impact. Any chance of that being the case? I've never used actual HC110.
Using the Jobo roller I cannot see how that method of agitation could produce the defect you've seen. Also, it appears on my laptop that the darker streaks are between sprocket holes; it cannot be surge marks. Lighter areas below the sprocket holes are an indication of bromide drag. I cannot see how these streaks are the result of bromide drag because of the axis of rotation. These simple observations lead me to believe that these streaks are an artifact that occurred during the manufacturing process at the factory. If this is the case, that would explain the defect only occurring in a select few frames, not affecting the entire roll. My suggestion: process another roll with a few frames of just pure sky and see if the defect happens again.
Note: I bulk load in a changing bag by hand rolling cassettes; I don't usie a bulk loader. Sometimes the sleeves aren't perfectly light tight and a sliver of light gets by my arm and produces the same effect seen on your negs.
Just my .02,
I had a look at the current HC110 data sheet and when I calculate back the amount from the capacity guidelines, it suggests a minimum of 12.5ml of concentrate per 8x10" or equivalent, which would also be per 36 exp of 35mm.
Interesting, I did not know that. All of the Jobo processors that I've seen only rotate the drum in one plane.
I discounted a light leak while loading the film in my changing bag because I didn't see any evidence of that in the area outside of the frames.
Recently I offered the same explanation for a similar problem as @Don Heisz does above. Someone responded that it would take a pretty exact amount of fogging to not show up as density on the clear film, but as a noticeable pattern on the exposed image. I agree with that remark. While it doesn't eliminate it as a possibility altogether, I would say that as fogging goes, I'd have expected clearer signs of it somewhere along the film. So I think some kind of chemical explanation still more likely, although that is equally problematic to explain in this case.
There is no possible manufacturers defect in the emulsion that can correspond to the location of sprocket holes, since those are added long after the emulsion is dry. (Are holes added or subtracted?)
|Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links. |
To read our full affiliate disclosure statement please click Here.
PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY: