CCBaggett@aol.com
Date: 08/23/02-02:54:00 PM Z
I bought a HOBO 8x10 from Bostick and Sullivan. It came with a 'plastic' (not
sure what exact material) ground glass. I found it too transparent for my
taste- hard to see the image. I replaced it with glass. I can't really see
any significant increase in weight. I love the camera.
Cheers,
Charlie
In a message dated 8/23/02 4:15:38 AM Eastern Daylight Time,
johnjohnc@core.com writes:
> >
> > > N1861@aol.com <N1861@aol.com> wrote:
> > >
> > > Has anyone made a ground glass from acrylic or polycarbonate sheet,
> > > as a
> > > lighter weight alternative to glass?
> > >
> John Cremati wrote:
>
> My concern would be the warpage of the polycarbonate sheet on a larger view
> camera as well as cleaning.....I have etched decorative designs into
> Plexiglas on many occasions as commercial artwork.. I have noticed several
> things about it.. I would think the huge advantage is that is very light
> weight , resists breakage, and my guess would be that once etched it
> should produce a great image as the etching seems to be extremely fine
> grained ...
> 1) After removing the protective cover wrapping the plastic seems to have
> a static electrical charge that attracts dust. This is very obvious after
> sandblasting, during which electrical fields may even become visible on the
> Plexiglas.. I usually have to flood wash the plastic when thru etching and
> this seems to neutralize the static electricity...
> 2) the plastic will warp or expand dramatically with temperature
> change..It may be wise to mount in a floating frame...
> 3) Plexiglas may become yellow with age.. a better grade of polycarbonate
> may be in order and should be researched..
> 4) The Plastic scratches very easily ...Special cleaners are used to
> minimize this as well a keep the plastic from yellowing.. These cleaners
> may
> get into the pores of the etched surface and may cause streaking, staining
> or a blotting appearance...This happens so much that on my decorative work
> I always use a separate plastic cover plate over the etched surface to
> protect it sandwiching the engraving......
> 5)During the sandblast process the plastic requires several passes as it
> does not sandblast easily .. This may be the reason for such a fine grained
> appearance when finished..The plastic probably resists the sand blast
> action
> and only allows for minimal penetration into the plastic surface.......
> Happy Trails,
> John Cremati
>
>
>
> >
>
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