Newly made large format dry plates available! Look:
https://www.pictoriographica.com
No newton rings. I get them too when scanning if I put the shiny side of the plate down, so I just don't do that. No problem with contact printing though.
Edit: I must add that I put a thin sheet of mylar between the glass negative and the glass of the printing frame, mostly to prevent scratches, but maybe it also helps preventing newton rings.
Last edited by koraks; 6-Jun-2018 at 03:20.
I've been using my (old) printing frames (including glass) with my glass plates with no issues whatsoever so far.
Robert
I have a 5x7 glass plate printer from the 1920s, if your interested I listed it over a month ago, or you might be able to replicate the basics. I used it 20 years ago and it worked fine. Where the silver flat piece is with the handle is what pushes down on the plate it has a piece of cotton like material that was glued to the flat silver it was about 1/4 " thick. Each one of the switches on the green front control 12 tiny bulbs for dodging and burning. Attachment 179463
Was the issue re Newton Rings ever resolved/explained? It seems to me that this might be an issue; I know it was with glass negative carriers in my enlarger.
When scanning glass plates, I put the emulsion side down against the glass bed and flip in PS, as suggested in an earlier post. Many, many years ago when I had issues with Newton Rings when analog printing in my darkroom Ron Wisner and I resolved it by having a sheet of plate glass single coated on one side (same coating used on lens elements.) I always thought these rings were caused by uneven contact, but I've also heard that humidity can be problematic in this regard; or, maybe, I just wasn't wearing my lucky underwear! Anyway, luckily I haven't had any ring issues in years...
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