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How Much Developer for 2 35mm Reels in Paterson Tank

steve mareno , Apr 09, 2013; 06:28 p.m.

I have one of those Paterson System 4 tanks. It takes 2 reels using 35mm, and one reel for 120. I looked on the tank and on the instructions, and it says how much developer to use w/ each, but not for 2 reels of 35mm. Do I simply double the amount for one 35mm reel? The reason I ask is that I developed 2 rolls of 35mm in it recently, and some of the negs have a darker line down the middle (horizontally). I had the film in two cameras, one w/ a vertically running shutter, and the other w/ a horizontal one. Can't remember which was first. I did put just 17 oz in it because I had been developing 120 before that and forgot to change the amounts. The tank calls for 10oz when using one 35mm reel. Maybe I should have put 20 oz in it?


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JDM von Weinberg , Apr 09, 2013; 07:03 p.m.

In my experience, not filling a tank means potential for various problems-- sloshing, foam, error in coverage, you know.

The tanks are so cheap these days, I just got a set of 1-reel, 2-reel, and so on tanks. That way I don't have to worry about filling it enough, agitation, and all the rest.

steve mareno , Apr 09, 2013; 07:32 p.m.

That's smart JDM. I would do the same, but I'm probably getting out of 35mm and going to just 120, so no need for additional tanks. Even when I was shooting 35mm regularly, it was once in a blue moon when I would put two reels in one tank.

JDM von Weinberg , Apr 09, 2013; 08:26 p.m.

My developer always ends up aging out before I use it up anyhow.
If you're like me in the amount of developing you do, just fill the tank all the way and chuck it or renew it. It's not that expensive, either way. I started out otherwise, but now I generally go 1:1 and use it just once.
I assume D76, of course, my old favorite, but you know whatever the equivalent is for whatever you're using... ;)

Larry Dressler , Apr 09, 2013; 08:33 p.m.

I have one of those tanks. I just double +5% for 2 reels. I never have developer go bad because I use it a lot. and I also replenish some developers and others I just use one shot like Rodinal and HC-110. I shoot 16mm through 4x5 so I tend to not worry about using too much developer as it is almost the cheapest thing in my supply line next to fixer.

john enea , Apr 09, 2013; 08:48 p.m.

I use about 26-28 ounces when I do two 35mm rolls. really nothing bad can happen if you use more than required, but if you don't use enough you are in big trouble. chems are cheap compared to messing up the development and ruining some film

Nige Buddy , Apr 09, 2013; 09:27 p.m.

Pretty sure my Paterson System 4 tank has the volume requirements on the bottom of the tank, but if I wasn't sure, I'd test it myself by measuring how much water is required to cover the reels (no film in reels and lid off so I can see what's happening)

steve mareno , Apr 10, 2013; 02:04 a.m.

Thanks. That all makes sense now, as I had a lot of surge marks on the top roll from not having enough developer in there, while the roll that was on the bottom was fine. 17 oz was obviously not nearly enough.

David Bebbington , Apr 10, 2013; 03:44 a.m.

Don't know fluid ounces :-) - 600 ml.

Harry Joseph , Apr 10, 2013; 09:35 a.m.

Usually I just double the amount for 1 reel with no problems. So 10oz for 1 reel, would 20oz for two reels etc...

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