The true alternative to plastic screens certainly is 'grind-your own', the way Rollei did it back in the fifties:
www.mynetcologne.de/~nc-kellersv2/grind.jpg The LP of focusing screens... Sven -----Ursprungliche Nachricht----- Von: Bob Blakely [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 20. November 2003 20:07 An: [EMAIL PROTECTED] Betreff: RE: Making your own (WAS Re: Anybody know where to get an SD-11 focusing screen?) Why not buy the safe glass etching cream sold in hobby stores everywhere? Try looking the stuff up for yourselves. Hint: Go to Google. Type "etch glass" Gawd! Why are you folks going through all this HF and/or NaOH?!!! Regards, Bob... > From: mike.wilson [mailto:[EMAIL PROTECTED] > > Fred wrote: > > > > If you have a piece of glass of the right shape and thickness, it > > > would be easy to "matte" one side with a solution of sodium > > > hydroxide. Some experimentation would be needed to get > > > concentration and times. > > > > Gee, I don't think that NaOH will do anything to glass. I think > > that, to etch glass, you need hydofluoric acid (HF). > > Needs to be quite concentrated and to stay there for a few hours but it > will make it nice and frosty with about 1/10th the danger of HF.
