Originally posted by davewell83 Hi Tuco,
Thanks for the reply - can you explain how the edge of the film can sometimes not develop evenly across the negative? Especially given these are vertical lines when the negative is sitting horizontally in the tank? I had a quick look at some c41 negs and coulnd't see the mark so it indicates to me it is a developing issue and I dev'd these rolls at home myself.
Cheers,
Dave
First, density streaks can be caused by several things. I mention agitation because of the 'streaking nature'. However something like exhausted or too small of an amount of developer can be a source too.
In small format, streaks around the sprocket holes are good indication of an agitation problem. Similarly, the fluid flow around a 120 developing reel common to the film's edge can be a source poor replenishment during an agitation cycle. I get that edge effect often when everything else on the negative developed fine. I bet most do-it-yourselfers have at one time or another.
If you're using the same developer (that's in good shape) and the same agitation profile you used before with success, then maybe the scanning/contrast curve adjustment is too aggressive for an over/under exposed negative kind of thing.
Would you care to share the film, developer and agitation profile you use?