46mm Secondary mirrors X3- Unaluminized

[Tropo-Bob]

One is opened; two are still wrapped in the protective wrapping that they came in.

Thickness of mirror is 14mm.

$20 includes postage.

Free to any Cairns person who wishes to collect in person.

[sl]

Bob, what's the source and expected quality of these mirror substrates?


~Steve

[Tropo-Bob]

Steve,

These were given to me from Laurie Hall who for a short period in the 1990's made 6 & 8 inch telescopes under the name Hall Engineering. From memory, he obtained these from Kasai Trading in Japan.

In the 1960s, Laurie made mounts, mirror cells etc for the Amateur Astronomy Supply Company, which later had a change of ownership and and became Astro Optical.