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Jim Cole
24-Jul-2008, 12:03
I'm having a bit of a problem deciphering Ilford's DD-X Fact Sheet.

It states that at 1:4 dilution 1 liter of concentrate should develop 16 rolls of 135-36, or about 62ml/roll.

I figure 1 roll of 35mm to be equal to about 2 sheets of 4x5, so am I right in assuming that I should be able to use 30-32ml of developer concentrate for each sheet?

I'm planning on using this as a one shot developer at 1:6 in a Jobo 2553 tank.

Thanks,
Jim

Sal Santamaura
24-Jul-2008, 14:29
...DD-X Fact Sheet...states that at 1:4 dilution 1 liter of concentrate should develop 16 rolls of 135-36, or about 62ml/roll...You've got that part right...

...I figure 1 roll of 35mm to be equal to about 2 sheets of 4x5, so am I right in assuming that I should be able to use 30-32ml of developer concentrate for each sheet?......and that part wrong. Four sheets of 4x5 = 80 square inches = 1 roll of 135-36. So, 16 ml DD-X concentrate per 4x5 sheet.

Jim Cole
24-Jul-2008, 14:46
Hi Sal,

Thanks for the help on this. I still get a little different number than you.

One frame of 35mm film is anout 24mm x 35mm or 0.94" x 1.37" ...thus ~1.3 square inches. 36 frames make for about 46 square inches, so we'll call it 50 with the leader.

One sheet of 4x5 is 20 square inches, so one roll of film equals about 2 1/2 sheets.

Rounding down to 2 sheets equivalent and I still get about 30ml per sheet.

Am I nuts here?

Jim Cole
24-Jul-2008, 16:18
Sal, I guess you're right after all. My methodology stinks I guess. I guess that's why I dropped out of the aerospace engineering program in college.

I got a confirmation from over at APUG that:

1 roll 36 exp 35mm = 1 roll 120 = 4 sheets 4x5 = 1 sheet 8x10

Thanks again.

ic-racer
25-Jul-2008, 06:35
I'm having a bit of a problem deciphering Ilford's DD-X Fact Sheet.

It states that at 1:4 dilution 1 liter of concentrate should develop 16 rolls of 135-36, or about 62ml/roll.

I figure 1 roll of 35mm to be equal to about 2 sheets of 4x5, so am I right in assuming that I should be able to use 30-32ml of developer concentrate for each sheet?

I'm planning on using this as a one shot developer at 1:6 in a Jobo 2553 tank.

Thanks,
Jim

So 12 sheets x 15ml per roll is 180ml concentrate x 7 = 1260ml solution. Don't know if the 2553 tank will hold that. What I do for these high dilution paradigmes is to split the developer up into as many as 8 bottles (depending on the dilution).

Sal Santamaura
25-Jul-2008, 07:59
...My methodology stinks...Thanks again.It doesn't stink, it's just incomplete. You didn't consider the leader, trailer, space between frames and everything around the sprocket holes, all of which needs to be developed. You're very welcome.

Jim Cole
25-Jul-2008, 08:21
[QUOTE=ic-racer;372534]So 12 sheets x 15ml per roll is 180ml concentrate x 7 = 1260ml solution. Don't know if the 2553 tank will hold that. What I do for these high dilution paradigmes is to split the developer up into as many as 8 bottles (depending on the dilution).

I only do 4 sheets per reel leaving the middle slot open on each side for more even development. The 2553 Tank with the cog gear opening can take 1500ml total solution before starting to leak out the opening. Since I only do a max of 8 sheets at a time (2 reels) my total solution using a 1:6 dilution of DD-X would be (rounded up for simplicity) 130ml of DD-X and 780ml of water for a total volume of 910ml. Easily within the capability of the tank. I rarely develop 8 sheets at a time, though.

The tank needs a ninimum solution of 560ml so I will need to make up a solution for at least 5 sheets at a time (16x5=80, 80x6=480, 80+480=560). I tend to like a bit more than the minimum solution so I will probably use enough developer for 7 sheets as my minimum or about 110ml of DD-X per use and try to develop 4-6 sheets at a time for economy. This would make the volume of DD-X solution about 770ml, about 210ml more than the minimum the tank requires.

I also think I may have solved my uneven development issues with the Jobo and Rodinal yesterday. I used a higher volume of 1+49 solution (1000ml of dilute Rodinal as opposed to the 600ml I was using to develop 4 sheets). I was also switching direction on the Unicolor Motor base every 30 seconds previously and I decided to switch every 15 seconds. My first Acros sheets with this new method look much more evenly developed. I think the combination of using more than the minimum requirements for the tank and switching directions more frequently may do the trick. I, of course, need some more testing before declaring this the fix to the issue.