[at-l] jackie's Q re my camera

[jbullar1 at twcny.rr.com (Jim Bullard)]

True, but from a semantic point of view the extremely fine grinding 
materials used in polishing are called polish. They are loose particles in 
a binder and are generally applied with a buffing cloth. Finer and finer 
grits are used until the remaining scratches are too fine to be seen. The 
term "ground glass" generally is used to designate a relatively coarsely 
ground piece of glass that is translucent but not transparent.

BTW - Not all glass lenses are better than the 'plastic' ones. Some of the 
acrylic lenses can hold their own against moderate quality glass ones. If 
you wear eyeglasses with 'light weight' lenses, you are viewing the world 
through 'plastic' on a daily basis.

At 09:33 PM 11/24/2003 -0500, Clark Wright wrote:
>not to grind away at too fine a point, but isn't "polishing" accomplished 
>by "grinding" on the same machine - just with a finer substance? :)
>
>thru-thinker [hiking today thru the looking glass slowly! :)]
>
>Bob C. wrote:
>
>>>"... with a ground glass lense?"
>>Technically, yes, but I think the word you want is "polished" glass -- or
>>perhaps just glass -- which is a far better lens material than the plastic
>>employed in many light weight, inexpensive cameras.
>>  Weary