On 12/12/2019 11:24 AM, dpb wrote:
On 12/12/2019 9:52 AM, wrote:
...

The problem is that the U/V damage goes all the way through the
plastic and polishing only tries to recover the surface.Â* Plastic will
never be as hard or U/V resistant as glass.

+238.5

I've polished the beegeezus out of the ones on the work truck...you'd
have to take off good fraction of the material it appears to get rid of
the crazing...it's not just a thin surface.

The 300M was almost as bad when traded it off.

It's terrible choice of material for purpose.

--



The plastics used for lenses are generally polycarbonate and
polymethylmethacrylate. PMMA has the best UV resistance. Both have
about the same scratch resistance which can be improved by coatings.
UV resistant coatings and antioxidants help PC the most is it absorbs
and is degraded by UV.