On 1/24/2004 9:04 AM Jean-David Beyer spake thus:

David Nebenzahl wrote:

On 1/23/2004 8:03 PM Jean-David Beyer spake thus:
I'm guessing that the problems associated with constant, invariant
agitation in this device (Jobo) must have something to do with the
interior geometry, topology or hydrology of the gizmo, as I never
have problems with my rotary processor, which is the Beseler Unidrum
(for 4x5 and 9x12). There must be something inside the Jobo--some
baffle or something else in the flow stream--that causes
standing-wave patterns, eddies if you will, that lead to these "road
ruts".

I disagree. If there were an _inherent_ problem to the Jobo processor
(more precisely, its tanks and | or reels), then _everyone_ would get
these problems, and I do not. Many people use them successfully, and
some even use their fancier reel-less tanks for negative processing with
success. [...]

The _only_ time I got what I might call road ruts was the stripe
parallel to the 5" edge when using the obsolete pre-2509N sheet film
reels. These have been discontinued a decade or two ago. By now, I would
have supposed people would have either upgraded their tanks and reels or
given up rotary negative processing.

So you're saying that anyone who experiences problems such as those described
by the OP must be using these old reels? Do we know what kind of reels he's using?


--
Focus: A very overrated feature.

- From Marcy Merrill's lexicon at Junk Store Cameras
(http://merrillphoto.com/JunkStoreCameras.htm)