[LargeFormat] Part 2 Hold ON!! Graflok ground glass

[Les Newcomer]

I picked up a box of ground etched glass while cleaning out an estate a
couple of the boxes say Trusite.  Any idea what this is?  

Les

Ken Hough wrote:
> 
> Clive,
> I have made lots of ground glass. When I use grinding compound I place a
> 1/2 inch plate glass on the bench and a slurry of roughing powder and water.
> Then I put the piece to be ground on top and start a figure 8 motion.
> I'll work it till the appropriate grind is done. But the acid is available in
> different grades. Coarse to fine. So no more hand grinding!
> Ken
> 
> To:                     largeformat@f32.net
> From:                   Clive Warren <cocam@cableinet.co.uk>
> Subject:                Re: [LargeFormat] Part 2  Hold ON!! Graflok ground glass
> Send reply to:          largeformat@f32.net
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> Date sent:              Sat, 15 Dec 2001 14:39:45 +0000
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> 
> At 2:31 pm -0600 14/12/01, Ken Hough wrote:
> >Has anyone besides me done this?
> >Ken
> >
> >>HOLD ON !! You need the following:
> >>   .062 thick glass. Go to a glass shop and have them order a sheet for you.
> >>If they will not try another glass shop. Or a stained glass shop.
> >>Pittsburgh Plate glass makes it. A 2x3 foot section costs 22.00
> >>Second, while at the stain glass shop get some acid etch for your glass.
> >>3rd. Get the glass cut to size minus 25 thou on 2 sides. This insures
> >>it will float a bit in the frame. Now the fun part. Put heavy clear
> >>packing tape
> >>on one side of the glass. Cover the whole side. Cut the excess tape off.
> >>Now apply the Acid etch. DO NOT LET THIS STUFF CONTACT YOU
> >>OR ANYTHING METAL. Do it in a tupperware tray. Let it etch fo the
> >>proper time. READ THE INSTRUCTIONS!. Rinse and remove the tape.
> >>Guess what kiddies! You have ground glass. Remember do not be afraid.
> >>My Motto is JUST DO IT.
> >>Ken
> 
> Looks like you're one of very few Ken!
> 
> I have used fine grinding paste (aluminium oxide) and some sheet
> glass and produced reasonable results. It is easier to focus with a
> ground glass rather than etched glass in my experience. However the
> image quality on an etched glass is significantly higher and in most
> cases preferable if focusing is not a problem.
> 
> Cheers,
>         Clive
> 
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>         ******Ken Hough Photographic Repair******
>          Specializing in Deardorff Refinishing
>           Lens Recementing and Shutter repair
>           Contribitor to McKeowns Price Guide
>                    Deardorff Section
>            Custom machined Photographic items
>            Text Contents Copyright 1999 KHPR
>           http://deardorffcameras.0catch.com/
>                    Est. 1980
> 
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