I'm just getting started with 4x5 and I've been having an issue with a blotchy pattern on some of my negatives. My previous film darkroom experience was processing and printing B&W 35mm.
I'm shooting Tri-X with a Toyo 45CF with brand-new Toyo holders, then processing myself in a Mod54 holder and Paterson tank, using D-76 (1:1) at the recommended developing time for the temperature. I'm agitating by using the rotary spindle on the Paterson tank (not inverting the whole tank).
The problem only occurs on certain negatives - usually it's over the whole image, but one of my sheets had it just along one of the long edges. Most of my negatives have turned out normally. In a batch of 6 the ratio of good to bad might be 6/0 or 4/2. I also can't find a pattern as to where the sheet was in the Mod54 holder.
If anyone has an idea where this might be coming from I'd appreciate any suggestions.
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