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Re: replacement diffuser material

  • From: P3D <CJMCE@xxxxxxxxxxxxxxxx>
  • Subject: Re: replacement diffuser material
  • Date: Thu, 28 Mar 1996 08:12:28 -0600 (CST)

>>I've used frosted mylar for years as a diffuser; even works for "quickie"
>>light tables...

>  Is it grainy?  The reason I ask is because in my first (pre-prototype)
>viewer I used some sand blasted glass. It diffused fine but had a
>grainy apperance that made slides look more grainy than they are.

No, it's not grainy; in fact I think it's the best possible diffuser you could
get.  The drafting mylars come in single-side frosting/coating and double-sided
varieties.  The 7.5-mil double-sided Keuffel & Esser (K&E) "Herculene Drafting
Film" is the most superior.  However, the most common types (because of cost)
are the 4-mil single-coated stock.  

The Photogrammetric Mapping Community has been using it for decades.


Clifford J. Mugnier  (cjmce@xxxxxxx)
Topographic Engineering Laboratory
Department of Civil & Environmental Engineering
University of New Orleans
New Orleans, Louisiana  70148
Voice: (504) 286-7095
FAX:         286-5586


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