Rotary processing my 7x17 inch film

<josburke RemoveThis @bellsouth.net> wrote in message news:<VDx0b.73
 > Yes I know Jobo has a 7x17 insert for a 16x20 print drum for a modest
 > Gazillion dollars.
 > Joseph Burke

I've seen a couple of home brew tubes to do 7/17 on the Jobo. You
might be able to make your own pretty effectively.

One design I saw used a short piece of 8" plastic pipe. It used a lid
for a 3000 series drum. The drum was about 10" deep and held one
sheet of 7/17. The guy used little styreen strips (from a hobby shop)
to act as the little rails that hold the film out against the inner
wall of the drum.

Another tank was similar, but held two sheets of film lengthwise down
a 20" tube. I imagine that it was a bear to load, but it could do two
sheets at the same time.

At a camera show out here I saw a home-made drum that was actually
pretty sophisticated. They essentially made their own 30XX 7x17 drum.
As I recall it, they used a tube within a tube. The small tube was
the same size as one of the little 1510 sized tubes, and used the 1510
gear lid. That was mounted in another tube, roughly the size of the
3000 series tube (about 8" diameter). The inner tube was a little
longer than the outer tube -- long enough to attach the lid. Plastic
discs were cemented in place to hold the two tubes apart. There were
holes in the end disc so the water bath circulated between the two
tubes. Film went in long-ways (drum was 18 inches long). They guy
who had it said he processed color in it with no problems.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rotary processing my 7x17 inch film 

josburke DeleteThis @bellsouth.net wrote:
 > Wish to try my hand a processing 7x17 negs (Korona).I have a jobo unit but
 > am interested in just using a beseler color drum (for say' 16x 20 prints) or
 > other less costly type rotary drum for trying my first 7x17 negs as opposed
 > to tray processing. any old hands at this in this format? what mods need to
 > be made to the print drum?
 > (BTW-I don't have a 16x20 jobo print drum in case someone is wondering). If
 > mods are needed then the jobo drum may not be the best choice --thats why i
 > mention a beseler as an alternative.
 > Yes I know Jobo has a 7x17 insert for a 16x20 print drum for a modest
 > Gazillion dollars.
 > Joseph Burke

I've done 11x14 negs in both an 11x14 and 16x20 Unicolor print drum.
I made no modifications and got good results. The 16x20 drum will
hold two 11x14 sheets. I've also used BTZS tubes (homemade) for 4x5.
Based on this I think as long as the 7x17 sheet curls far enough
around the inside of the tube, you don't need any rails or ridges
to hold the film edges. If you curl the sheet around the 7" dimension
you could make a BTZS tube with a diameter of about 7.5/pi. I think
black ABS comes in 2 1/2 inch diameter which would be fine. Cut them
17 and a bit long and get 2 end caps each. You could use a 16x20 tray
for the water bath / floatation.

I know there are lots of more detailed references to BTZS tubes, search!

--
Sandor Mathe
sandorm.no.spam DeleteThis @ca.ibm.com<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rotary processing my 7x17 inch film 

<josburke RemoveThis @bellsouth.net> wrote in message
news:VDx0b.73$qw1.69@fe04.atl2.webusenet.com...
 > Wish to try my hand a processing 7x17 negs (Korona).I have a jobo unit but
 > am interested in just using a beseler color drum (for say' 16x 20 prints)
or
 > other less costly type rotary drum for trying my first 7x17 negs as
opposed
 > to tray processing. any old hands at this in this format? what mods need
to
 > be made to the print drum?
 > (BTW-I don't have a 16x20 jobo print drum in case someone is wondering).
If
 > mods are needed then the jobo drum may not be the best choice --thats why
i
 > mention a beseler as an alternative.
 > Yes I know Jobo has a 7x17 insert for a 16x20 print drum for a modest
 > Gazillion dollars.
 > Joseph Burke
 >

I have no experience processing 7x17 but I have used a few different tube
systems for my 4x5 work. I have found that smooth walled tubes can prevent
complete washing away of the anti-halation dye during processing in the tube
(though it can be washed away afterwards).

Aside from that smooth walled tubes can make removing your negative a little
more difficult at they tend to adhere quite firmly to the sides. I found
that filling the tube with water while removing the negative helped me.

I have modified a couple of Dev-Tec print tubes for 4x5 film with great
success. I glued styrene strips inside lengthwise to allow the chemicals to
get behind the negs. I also glued in wider plastic strips to hold the
negatives in place much like in the Unicolor drums. In fact I can use the
Dev-Tec tubes on my Uniroller motor base very well. The Dev-Tec tubes are
quite inexpensive and are available in various sizes.

Sherman
<a style='text-decoration: underline;' href="http://www.dunnamphoto.com" target="_blank">http://www.dunnamphoto.com</a><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rotary processing my 7x17 inch film 

On 8/19/2003 3:51 PM josburke RemoveThis @bellsouth.net spake thus:

 > Wish to try my hand a processing 7x17 negs (Korona).I have a jobo unit but
 > am interested in just using a beseler color drum (for say' 16x 20 prints) or
 > other less costly type rotary drum for trying my first 7x17 negs as opposed
 > to tray processing. any old hands at this in this format? what mods need to
 > be made to the print drum?
 > (BTW-I don't have a 16x20 jobo print drum in case someone is wondering). If
 > mods are needed then the jobo drum may not be the best choice --thats why i
 > mention a beseler as an alternative.
 > Yes I know Jobo has a 7x17 insert for a 16x20 print drum for a modest
 > Gazillion dollars.

Check out my page that explains how to process 9x12[cm] film in a drum
normally set up for 4x5, using a homemade adapter:

<a style='text-decoration: underline;' href="http://www.bonez.info/photo/9x12_Unidrum.htm" target="_blank">http://www.bonez.info/photo/9x12_Unidrum.htm</a>

Different size than your needs, but the same principle.

--
At Boston/Logan airport last Friday, I saw on a Delta departures/arrivals
screen this Windows error dialog in front of the grid of flights:

"At least one service failed to start..."

I took a photo of it. I thought:

"I'm glad I don't run Windows. I'm glad I'm not flying Delta today."

- Recent posting on Slashdot (http://slashdot.org/)<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rotary processing my 7x17 inch film 

In article <3F5160F7.6090007.TakeThisOut@but.us.chickens>, David Nebenzahl
<nobody.TakeThisOut@but.us.chickens> wrote:

 > On 8/19/2003 3:51 PM josburke.TakeThisOut@bellsouth.net spake thus:
 >
  > > Wish to try my hand a processing 7x17 negs (Korona).I have a jobo unit but
  > > am interested in just using a beseler color drum (for say' 16x 20 prints) or
  > > other less costly type rotary drum for trying my first 7x17 negs as opposed
  > > to tray processing. any old hands at this in this format? what mods need to
  > > be made to the print drum?
  > > (BTW-I don't have a 16x20 jobo print drum in case someone is wondering). If
  > > mods are needed then the jobo drum may not be the best choice --thats why i
  > > mention a beseler as an alternative.
  > > Yes I know Jobo has a 7x17 insert for a 16x20 print drum for a modest
  > > Gazillion dollars.
 >
 > Check out my page that explains how to process 9x12[cm] film in a drum
 > normally set up for 4x5, using a homemade adapter:
 >
<font color=purple> > <a style='text-decoration: underline;' href="http://www.bonez.info/photo/9x12_Unidrum.htm</font" target="_blank">http://www.bonez.info/photo/9x12_Unidrum.htm</font</a>>
 >
 > Different size than your needs, but the same principle.
 >
 > --
 > At Boston/Logan airport last Friday, I saw on a Delta departures/arrivals
 > screen this Windows error dialog in front of the grid of flights:
 >
 > "At least one service failed to start..."
 >
 > I took a photo of it. I thought:
 >
 > "I'm glad I don't run Windows. I'm glad I'm not flying Delta today."
 >
 > - Recent posting on Slashdot (http://slashdot.org/)



BTW, I have a 16X20 Unicolor drum that has built-in internal dividers that
allow you to develop two sheets of 7X17 film at a time. The 16X20 Beseler
drums came with removable dividers and you could also set one of these
drums up to do two sheets of 12X20 at a time, provided you have the
dividers.

The only general precuations I recommend for processing film in print
drums on the motor bases are, 1) give the film a pre-wash of about five
minutes, and 2) remove the drum at regular intervals (every one or two
minutes depending on the total length of development) from the motor base
and agitate if vigorously form side to side for about 10-15 seconds. You
may get bromide drag with some film/developer combinations if you don't do
this.

Sandy King<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Rotary processing my 7x17 inch film