Heads up - pre-Meade Coronado 90mm etalon for sale

[Highbury Mark]

These things don’t come up very often - for good reason. Owners don’t sell them. An Isle of Man Coronado 90mm etalon with BF30 blocking filter is for sale on U.K. site (ENS Optical) - £3,000. They have a good reputation as a seller of used astronomy gear, though their prices are usually high. This seemed to me to be fairly priced if it’s typical of the Isle of Man solar filters. Thought someone on Solarchat might be interested?

[Sebastien Lebouc]

Very interesting!
It would be nice for double stacking a lunt 100mm!
Seb (France)

[marktownley]

He also has a SM90ii scope double stack

https://ensoptical.co.uk/index.php?rout ... h=coronado

I can vouch for Steve who owns ENS

[Sebastien Lebouc]

thanks for sharing...
Actually:

20230424_121338.jpg (1.98 MiB) Viewed 1333 times

20230424_121433.jpg (2.09 MiB) Viewed 1333 times

20km from OHP, observatoire de haute Provence 1,93m telescope dome

[marktownley]

Very nice! How do those etalons perform? Very contrasty I guess with a triple stack.

[Dennis]

thanks for sharing...
Actually:
20230424_121338.jpg
20230424_121433.jpg

20km from OHP, observatoire de haute Provence 1,93m telescope dome

Wow, what a site and setup *thumbsup*.

[Sebastien Lebouc]

Very nice! How do those etalons perform? Very contrasty I guess with a triple stack.

yes, filaments are pure black, and proms around the disk are still bright enough.
In fact, I have 2 generations of BF30, on one the ITF is removable, not on the other.
I have replaced the original ITF, too dim, by a 2" beloptik KG3 anti UV-IR, and the sun is bright, standing in a pure dark sky

Stay tuned, in 2 weeks we are trying a quadri stack