Re: ATM chipped mirror

[John Vogt <atmer@idt.net>]

Jan van Gastel wrote:

> Today Steve Swayze emailed me that my 20 inch f/5 mirror is back from the
> coater (Spectrum). But: during the coating proces somewhere, a chip came of
> the edge. It is about 18 mm wide and 13 mm in from the edge, as Steve says
> "like putting a fingernail on the edge". According to Steve this will have
> absolutely no visible effect on performance at all

Jan----

Just make sure that the chip didn't raise the surface due to any stress relief
and affect the surrounding area. Have seen this happen in the past w/  solid
glass mirror and of course w/ cellular mirrors.

John