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Maybe try pulling a piece and scan it without any processing at all. If there are visible marks, then try washing it and rescan and see if they go away.
That would help eliminate processing sources....

Seezee, that's one of the best I've seen on x-ray. I'm going back to give it a try again.
What rating did you shoot it at?

I had not ever heard of Sprint developer and looked it up online. Fascinating. Not my thing... I'd never choose an all in one system like that, but I can see the attraction for a school lab. But they...

I like it. Good idea on the chalkboard paint! I am going to try that. Mine are all projector lenses from secondhand stores. I like them better than commercial offerings.

Sent from my Moto G (5)...

That spreadsheet is great.
I found one I haven't seen in the thread (not that I've read everything).
It's Flow dental film. 5"x12", full speed green, in a box of 50 sheets. I would assume it's made...

I have those chemicals so I popped out in my driveway and took a shot on Arista Edu Ultra 100 4x5 just at sunset tonight. I developed it in Rodinal 1:50, agitation for first 45 seconds and then every...

If you were going to add the helicoid focusing, ground glass etc, why not purchase a used press camera or small monorail? I think you could buy a complete setup for less than you might put something...

Mick can reply on his own but from my understanding it is fixed focus... You use the tracing paper and shims to set the focus at infinity. I would be concerned about depth of field with a long lens....