Uneven negs with daylight tank

[jwarren116]

Recently I've been using a nifty daylight developing tank for my 4x5 stuff. Specifically it's a Yankee Agitank. More and more I'm getting these crazy over-developed edges. I think I'm pretty consistent with my agitation (5 agitations per minute). I'm using PMK to develop. The over developed areas definitely match the slits that allow developer to circulate in the tank. It seems to only happen to about half of my negatives though. Any ideas? Is it just a cheap-o tank and I need to spend the big bucks on a better designed tank? I think I'm pretty gentle in my agitation... it's not like I'm shaking the tank vigorously or anything. I move the tank longways about an inch in each direction. Each full agitation takes about 2 seconds. I'd appreciate the help!

[Ash]

I had a similar thing with a more expensive tank. I'm not a fan of these type because it takes SO long to fill up the whole load of liquid.

Try diluting chems and increasing your development time, and overfilling - that's what I do. By going a little over the 'capacity' you're making sure there's well enough to cover all the negs. By diluting you're making sure the edges don't develop much faster than the rest.

Try tipping more, gentle but thorough agitation by tapping and swaying the tank - avoid bubbles but promote liquid movement.

[chy]

Like Ash said, try increasing dilution, development times and overfilling as much as you can.

The Yankee tank was the first "daylight" tank I used in trying to move away from open tray development. This was way back in the last century and I'm surprised to hear that the tank is still on the market. It leaks (at least the one I had, unless the design has vastly improved) and I too got uneven agitation. I quickly went back to open trays until I got the HP Combi-Plan tank. If you want to use a daylight tank, the HP is much better and can be inverted. Another option is using a tubular print drum and motor base or the Jobo system.

By the way, did you figure out your problems with the scratches on FP4?

[Erich Hoeber]

Many folks have edge density trouble with this tank. If you want a daylight tank I second the HP Combi as a good choice. A little quirky, but very reliable. Search previous threads.

[steve simmons]

I've been using a nifty daylight developing tank for my 4x5 stuff.

It can't be that nifty if it does not work. I tried these tanks years and years ago when I was afraid of developing my film w/o lights being on. I could not make them work, finally gave up and bit the bullet and tried trays. I had almost immediate success and learned that I could do 6 sheets simultaneously but each one for a different time. This can not be done with an enclosed tank of whatever brand.


just my 2 cents.

steve simmons

[jwarren116]

I'll definitely try increasing dilution and trying different agitation, but I have a feeling I might have to figure something else out.

And no, still stumped by the cracks in the film base. I pulled a sheet straight out of the box and there were no marks. I'm wondering if it might have something to do with a fluke in the processing combined with an odd box of film. I did run across a sheet that had significantly less marks on it though. I'll crack into a new box tomorrow morning. We'll see.

[eddie]

i use a "doran" daylight tank. no development problems in over 800 negs. try it.

mostly i use hc110 dil h (1:63) or dil g (1:119). i ma now trying pryo hd 1:1:100 and have no problems. i like to play on the computer between agitations!

eddie

[Clay Turtle]

Iáve used tanks I even use universal tank film tank as I would jobo system for paper development continues rotationto produce even distribution. you may need to alter development time because of the continues agitation but I have used this system out in the boonies to develope b&w many times without problems.

[Glenn Thoreson]

I hate those Yankee tanks. One way to make them work flawlessly, though, is to use more than one. Throw the lids away and use them as a dip-n-dunk line. Of course, that kind of eliminates the daylight option. I use a Unicolor roller and tank.

[Jim Noel]

If a tank gives the kind of results you show, I would not call it "Nifty", I would call it "Junk". In my more than 60 years of photography, I have never seen a daylight tank for sheet film that gave reliable results time after time.