On Tuesday, 12 July 2016 00:09:27 UTC+2, Razzmatazz wrote:
I did some imaging of Mars last Saturday in fair seeing just after sunset with my 175 refractor, 250 Mak and 305 Mak.

http://www.astromart.com/common/imag...6.jpg&caption=

Camera is a cheap and cheerful QHY-5-II color camera

Stunning images! Well done!

You can truly call them "All your own work!" :-)

You've come a very long way since the S&T article on "the refractor which bored holes in the sky." My home written ray trace software showed the prescription was wrong. You had changed the glass from the first lot of [unobtainium] KZNFS1 to KZNFS4 [from very fuzzy memory}. When I contacted Schott to buy some 6" blanks [to try to copy your prescription] they wanted a fortune!