On Mon, 29 Oct 2007 13:27:20 -0400, "Eisboch" wrote:


"Eisboch" wrote in message
m...

I always got a kick out of people who wear glasses and pay big bucks for a
"scratch resistant" coating on plastic lenses. The coating is actually
called a hydrophobic coating and does absolutely nothing to make the lens
surface "harder". All it does is adds a bit of lubricity to the surface
so dirt or dust will tend to slide off rather than scratch the plastic
surface.

Wiping them with mineral oil will do the same thing.

Eisboch


Another thing that always cracked me up ....

Many people pay 50 bucks or more extra for an "anti-reflective" coating.
There's nothing wrong with that .... the anti-reflective thin film coating,
if properly done, works just fine.

What is goofy about it though is that it isn't a true, flat antireflective
coating. The thin film design includes a slightly reflective "bump" in the
green light spectrum, and is called "neutral green" in the ophthalmic
eyeglass coating industry. It's only purpose is to assure the customer
that indeed, his/her glasses got the special, 50 dollar treatment. A good
anti-reflection coating would not have the green tint.

I have a 6-inch diameter flat glass that was masked in all but the center,
3-inch diameter section. A very good anti-reflection coating was applied to
the unmasked section. If you look at it, it appears to be an 6-inch glass
plate with a 3-inch hole in the center.

Eisboch


You know too much stuff.

What you said wouldn't help you clean a croaker any faster than I.