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View Full Version : Ground Glass / lexan, plexi



Ty G
04-10-2010, 10:15 AM
I know someone out there has done this. Ever tried to grind lexan or plexi for a ground glass viewing screen? I am working on a 20x24 and figured that would be great to help prevent possible breakage. If you have done this, how "bad" is the image quality?

Steve Smith
04-10-2010, 11:09 AM
Lexan is available with a fine textured surface which I have used in place of ground glass.


Steve.

Rick A
04-10-2010, 01:38 PM
I have an 18"x24" GG made from quarter inch plate glass, its pretty durable.

coriana6jp
04-11-2010, 10:27 PM
I haven't tried grinding any glass myself, but both my 8x10 and 12x20 have plexi glass screens. They are bright, durable and don't break like glass. They are great.

Gary

Ian Grant
04-12-2010, 05:03 AM
Lexan is available with a fine textured surface which I have used in place of ground glass.

Steve.

Where from ? (In the UK)

Ian

Steve Smith
04-12-2010, 05:13 AM
Where from ? (In the UK)

Cadillac: http://www.cadillacplastic.co.uk/

Plastic Technology Service Ltd: http://www.ptsuk.com/ - Polycarbonate here: http://www.ptsuk.com/longhua.html (PC813F).

A similar product but in polyester is available from Autotype/McDermid: http://www.macdermidautotype.com/

We only use these materials up to 0.25mm which is a bit too thin for focusing screen use (although I have used it) but most are available at least up to 1.5mm.


Steve.

Shutterbob
04-12-2010, 05:32 AM
I'm pretty sure that glass is not ground but sand blasted or etched. You might want to check with a glass crafter or leaded glass supply house in your area.
Bob

Ian Grant
04-12-2010, 05:56 AM
I'm pretty sure that glass is not ground but sand blasted or etched. You might want to check with a glass crafter or leaded glass supply house in your area.
Bob

Bob it's either Ground or Etched using Hydrofluoric acid, but grinding gives the best results. Welcome to APUG BTW.

Ian

Todd Foster
04-13-2010, 10:02 AM
Hi. Looking to buy 4 X 5 ground glass for my Toyo Field Camera. The Satin Snow source seems to be gone. Anyone have a source for it now?
Thanks, Todd F.

Ian Grant
04-13-2010, 10:20 AM
Brilliant Glass, Stephen Hopf hope I spelt his name right sells on Ebay from the US, excellent glass at good prices.

Ian

Monophoto
04-13-2010, 03:05 PM
Similar question came up the other day on LF Forum, and Bruce Barlow noted that Richard Ritter uses plexiglass as the standard 'ground glass' in his ULF cameras. Sand King jumped in to say that the experience he has had with a RR camera is that the plastic GG is just as good as regular glass, plus it's lighter in weight and unbreakable. The only downside is that plastic can be attacked by some solvents (which probably shouldn't be allowed within five miles of a good camera anyway), and can scratch.

Ritter gave a presentation at the 2005 LF Conference on quick and dirty field repairs in which he suggested that if you break your ground glass while traveling, just whip into a Walmart to buy a cheap plastic hoto frame of the appropriate size, and a package of fine sandpaper, then sand the plastic from the frame to make a replaceable ground glass.

I purchased a fresnel from Calumet for my Zone VI lightweight. The fresnel/ground 'glass' is actually plastic, but there is a thin cover glass to go over it. But the image is actually formed on the plastic fresnel/ground glass.