RE: [Leica] HP5+ 4"x"5 sheet in D76 using Jobo tank

["Tim Atherton" <tim@KairosPhoto.com>]

In think I noticed a while back that the Ilford times for 4x5 and 35mm on
their guide were the same for both sizes (unlike Kodak).

I have the same tank as you, but haven't used it much (I'm just going back
to doing some 4x5 bw). I tried hand rolling it, and it can be a bit of a
pain. I've been thinking of making a simple roller based electrical gizmo to
do it (looking out at garage sales for one of those old rock polishing
setups that were all the rage a few years back). My other  thoughts have
been to try treating it as an enclosed sheet holder/developing tank. It must
contain about twice what the smaller rubber Kodak tanks hold and I've used
those to develop a few sheets at a time. With those, I just agitate the
holders every 30 seconds. I'm planning on running some tests to see if you
can run the Jobo like a giant 35mm tank and use hand agitation. I know
someone else makes what is basically a square tank with a lid and inlet
outlet, with built in sheet holders. The main complaint about it being that
the lid always leaked. So the Jobo may just work like that. I would probably
start by using the recommended times for hand/tank development rather than
continuous agitation.

Tim A


PS - got the Jobo tank + loading base for a good deal on e bay a while back!

> -----Original Message-----
> From: owner-leica-users@mejac.palo-alto.ca.us
> [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Jeff S
> Sent: March 15, 2000 4:55 PM
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: [Leica] HP5+ 4"x"5 sheet in D76 using Jobo tank
>
>
> rkm wrote:
> >
> > Does anyone have experience with processing HP5+ 4"x5" sheets using D76
> > stock (replenished) using a single reel tank? I'm used to 35mm film
> > processing but have bought the Jobo single reel tank for 4"x5"
> > processing. The single reel holds a maximum of 6 4"x5" film sheets. I'm
> > going to use the same times Ilford recommended for 35mm film but not
> > sure how to ensure there's enough chemical activity for 6 sheets. Cant
> > find anything on Jobo website. Jobo says to keep liquid volume under
> > 1000ml. I'll be hand rolling the tank.
> >
> > Is using the 1:1 dilution a better way to go?
> >
>
> According to Kodak datasheet J-109, the area of a roll of 135-36 is
> about equivalent in area to a roll of 120 film, 4-4x5 sheets or 1-8x10
> sheet, and they rate developer capacity based on this area, so the
> answer to your capacity question is that 6 sheets of 4x5 film = 1-1/2
> rolls of 135-36.
>
> During the grand opening of Denver Pro Photo, I asked Ken Owen, Jobo's
> Technical Sales Manager (keno@jobo-usa.com) about max liquid capacities
> for Jobo rotary processing. He told me that you can keep filling up the
> drum until liquid starts pouring out the other end of the Jobo Lift! He
> assured me that the added liquid would circulate just fine. I didn't ask
> about hand rolling, but I'd probably fill the drum up about half way:
> For the #2521 tank, that comes out to about 800 ml--more than enough
> liquid capacity to process 6 4x5 sheets in Xtol at 1:3 dilution or HC110
> dilution B and probably 1:1 D76 as well, but better double-check the
> Kodak D76 datasheet.
>
> Love that Jobo!
>
> --
> Jeff Segawa
> Somewhere in Boulder, Colorado
>
>