Shel Belinkoff wrote:
>
> My concern is this. If I understand the JOBO's operation correctly,
> the tank is in continual rotation throughout the entire developing
> process. If that's the case, it would seem that shadow density and
> highlight density would be substantially changed from using small
> tanks by the constant agitation, and that a different EI and perhaps
> substantially less developing time would be needed for a given
> film/developer combination.
This is correct as I understand it. Supposedly you can compensate for
this.
Tsk, tsk, tsk. Shel relying on a machine to agitate his film?! What
next? Valentin renouncing women?
> How do those of you who use the JOBO compensate for the different
> agitation of the processor vs using a small tank with manual
> agitation?
What if you could process five rolls at a time your normal way? Would
that help speed your processing, or do you use different film types, or
some sort of development compensation?
I use Jobo tanks, but do it by hand. You can get an extension tube for
the 1500 series tanks, and with that you can process up as many rolls as
you want. I guess the practical limit is maybe 8, but I use the 2 roll
tank and 3 roll extension and never do more then 5 at a time.
http://www.jobo-usa.com/products/1500.htm
I developed 15 rolls of b+w last weekend in under 2.5 hours. Warning:
it's a pretty serious workout!
The only drawback to doing all those reels at once is that it takes a
few seconds to dump the developer in. The top reel probably gets about
10 seconds less time in the developer then the bottom one, but my times
are usually over 8 minutes so I can't see any difference.
On a side note, Jobo has contracted Hewes to make steel reels for them.
At first, you had to get a special metal replacement core to use them,
but recently they released steel reels that fit right on the regular
Jobo plastic cores. I just picked one up and it's *very* cool. Steel
reels with Jobo tanks is a very nice system.
tv
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