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Re: Uneven Jobo Development
Kerry,
I'm afraid this is unavoidable with standard (non-"Expert") drums. Jobo
sells large drums with Expert liners which work fine, but are expensive
and do only one sheet at a time. You can make smooth home-made tubes
from ABS pipe, but lose the semi-automatic functions of the Jobo processor.
Fred Newman has told me that recently he's had success developing 8x20's
in Jobo print drums using the specific combination of Ilford HP5-Plus in
D-76. No streaking with this combo, but the same film in other
developers didn't work.
At least for now, I've resigned myself to developing all of my oversize
film in trays, doing batches of 4-8 sheets in either TMaxRS, HC110, or
pyro PMK.
---Carl
Kerry Swartz wrote:
>
> I've started processing 8x20 sheet film in two Jobo print drums joined
> together to fit the 20" length with my ATL 2. Because of the larger ridges
> inside the drum I'm getting turbulance and overdevelopment along all the
> edges, may 3/8 - 1/2 inch. I've tried varying the rotation speeds from
> slowest (25) up to mid speed (75) with no change except an overall decrease
> in negative density. I presoak my film and right now I'm just testing with
> silver chemistry before switching over to Pyro. Any suggestions or similar
> experiences?
> Many thanks in advance.
> Kerry Swartz
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