Re: Shot in the Dark -- grainless, matte finish glass?

From: redbelly (redbelly98_at_yahoo.com)
Date: 03/18/05 

Date: 18 Mar 2005 07:01:24 -0800

One suggestion, how about using a thin *** of white teflon between
the two glass layers?

You can get as thin as 0.001" from McMaster-Carr. According to them,
the color "varies from translucent white to opaque white depending on
thickness and shape"

For example,

0.001" thick, 24" x 12" for $2.10, catalog # 85905K62
0.002" thick, 12" x 12" for $1.20, catalog # 8569K34
0.005" thick, 12" x 12" for $2.33, catalog # 8569K38

Prices are about 5 years out of date, but should still be pretty cheap.
 Check out http://www.mcmaster.com and enter these catalog numbers for
current information and other thicknesses available.

Mark

jlafferty wrote:
> Hey,
>
> I've mentioned in other threads here I'm developing an adapter that
> mounts 35mm lenses on DV cameras, to get the manual focus and DOF of
> a 35mm lens. Here's the link to a
> tutorial describing an older prototype, for any interested.
>
> On the offhand chance that some of you in your expertise could school
> me on creating a focal plain free of visible grain, I'm posting this
> to seek your advice.
>
> The project originally started with a piece of thin plastic hand
> ground with very fine sandpaper, then moved to glass ground with 5
> micron aluminum oxide.
>
> Now, I've been playing with sandwiching as thin a layer as is
possible
> with the tools at my disposal ("the kitchen") of microcrystalline wax
> between two layers of glass -- the grain looks pretty fine but the
> image doesn't yet resolve as well as with the AO ground glass.
>
> I've searched high and low for "fogged" glass or plastic, coated or
> fumed that catches an image without dispersing too much light, and
> without showing its grain on tape -- all with no more luck than the
> above two techniques. I've been to Canal Plastics here in NYC and
> looked over their samples, I've tried acid-etching, I've even tried
> the sprayable glass frost.
>
> Any advice? Thanks!
>
> - jim
>