Re: Print Frame Glass Quality

Herold Faulkner (faulkner@redshift.com)
Wed, 01 Apr 1998 19:16:58 -0800

If you are using a sufficiently diffuse light source (i.e., a bank of
flourescents at fairly close range, like if you were using a platinum
source) and if the blemish is not on the negative side of the glass it
really shouldn't make any difference. On the other hand, if you are using a
point source or highly collimated light source it could be problematic. So,
stay outta the sun.....

Optical glass in the size needed for a print frame would most likely be too
expensive for all except Bill Gates and Warren Buffett.

Hal

-----Original Message-----
From: Cyclamate <Cyclamate@aol.com>
To: Bob_Maxey@mtn.3com.com <Bob_Maxey@mtn.3com.com>;
alt-photo-process-l@skyway.usask.ca <alt-photo-process-l@skyway.usask.ca>
Date: Wednesday, April 01, 1998 5:44 PM
Subject: Print Frame Glass Quality

>Have any of you had any experience in obtaining "optical quality" glass for
>your print frames? I have built several contact print frames and have had
>problems in getting blemish free glass. It seems that nearly every time I
>have bought a new, clean piece of float glass that was pre-inspected by
both
>myself and the glass man, a small defect or two shows up upon printing. Is
>there such a thing as "optical quality" glass? How is optical quality
glass
>manufactured?
>
>Thanks for any experience or advise you can offer.
>