uneven development at the edges

I'm hoping that all you clever people can help me. I've recently

started developing 10x8 in a 12x16 tray with 3 litres of dev and

the problem I'm having is more density at the edges particularly

where the image is slightly shifted more to one side of the film(if you get

my meaning)if anyone can help that would be great.

<p>

Chris Kargotis

Chris,

It's hard to believe your trouble is related to development, at least

if you're processing one sheet at a time. Light uneveness on

enlarging seems more probable. Check your light output without

(negative on film stage), printing for a medium gray and develop

normally as you've been doing. Good luck.

<p>

Cesar B.

I have not done much tray development of sheet film, but I hear the

extra edge density is due to developer sort of rolling up around the

edge of the film and giving more agitation to that area. You might

need to try agitating a different way, or changing the amount of

solution so the whole negative sits deeper.

Chris: I would suspect you are getting a swirling effect at the edges

of of the film from the tray, especially if you are rocking the tray.

Try agitating the film by lifting it out of the developer and turning

it over. Do this gently. Also make sure there are no rough places on

the bottom of the tray.

<p>

Regards,

I would guess it is from uneven agitation or too much agitation,

possibly agravated by not enough developer in the tray or too many

sheets in the tray at once. Add more developer, develop less film at

one time, review your agitation technique -- it can't hurt (except it

uses more chemicals) but with the money you spent on film and the

trouble you went to to put the film into the camera and point it at

something, well, you might as well try it.

I do this all the time with no apparent problem, and you are using a

larger tray and a lot more developer than I use. But I agree with

everyone, it has to be your agitation technique. My technique has

always been to rock the tray back and forth and up and down very

gently (though several people above seem to indicate I shouldn't be

doing this). For the once-per-minute agitation I just lift a side of

the tray 4 or 5 times, but I work my way around the tray and lift a

different side each minute. I guess it's whatever works for you. Just

try changing your pattern until you find what works. You didn't say

what film and developer you are using, or if you are pre-soaking. I

always pre-soak for a couple of minutes--supposedly this allows the

developer to diffuse into the emulsion more evenly.