[ap-gto] [ap-ug] Life after the Stowaway

W Hilmo

Now you are just teasing us :)

On 1/18/22 7:51 PM, Roland Christen via groups.io wrote:

...For me, I like quartz optics in a reflector. Would not make them any other way. Quartz holds its shape even when the mirror is very thin and light weight. My 17" Quartz Cassegrain astrograph has a mirror that is only 12.5mm thick at the edges. I can hold it up in my right hand....