You will love the Jobo. I am using the series 1500 tanks for
my roll film and the 2000 series for the large format. Ilford
states that you need at least 100ml od _stock_ solution per
film. The series 1500 tank with 1 extension (this will hold 5
35mm reels) requires 560 ml to fill to capacity (do not exceed
this quantity), This would indicate that if you want to use
Microphen 1:1, you will have to use 2 tanks of developer,
changing it out halfway through the developing cycle to avoid
exhausting the chemistry.
Make sure for film processing that you use the machine on it's
slowest speed.
This presumes you are using a Jobo processor as well. If you
are just using the tanks for inversion agitation, then you will
have no problems with the chemical capacities. As you noted, you
will be 20% above what Ilford states as needed for proper
processing.
William Robb
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----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: June 3, 2001 5:11 AM
Subject: OT: 5 films in one tank DEVELOPING
>
> Hello!
> I need some advice from the experienced darkroomers out there,
please!
> I finally found a cheap secondhand tank JOBO 1000 with up to 5
reels of 135 or 3 reels of 120 film at once, 1200ml capacity. It
looks great compared to the tank I
> used before (2x135/1x120, leaking,...).
>
> 1) I use lots of Microphen 1+1 on HP5+. My questoin is, can I
safely develop 5 films at once using the 1200ml of 1+1 developer
(that would be 120ml of stock
> developer, should be well enough per film), without any
increase in time? Because Ilford states that if one reuses a
stock developer (e.g. 1l of stock, used for 10
> films. For second film - +10% time, third film +20% ... tenth
film +90% time), one has to increase dev time per each other
film. But what if I develop all the films at once
> (or half of them)? Do I have to increase time somewhat? Either
developing with stock or diluted microphen.
> Thanks a lot.
> 2) The JOBO 1000 was accompanied by a slightly more expensive
JOBO 2000, which was almost 2 times as big (capacity, not
height) with 1900ml capacity
> (5x135/3x120). It had bigger diameter. Is this tank (J. 2000)
also usable with sheet film, using some special holders? I can't
otherwise see why to make it with such
> big capacity (except that I would be able to use dilutions
beyond 1+1 Microphen, which I do not use much, and which I can
use even in the J 1000 if I make a run of
> fewer films)
>
> Thanks for any advice
> Frantisek
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