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iOptron ST90?
Posted: Mon Feb 22, 2021 2:44 pm
by pakarinen
Ummm, so this just popped up on a random Google search. $189 for a 90mm? (Single speed R&P though.) F5.6
https://www.adorama.com/atiotar90.html? ... dl-gbase-p
Re: iOptron ST90?
Posted: Tue Feb 23, 2021 1:21 am
by Refractordude
Found two reviews. Left click the image.
Re: iOptron ST90?
Posted: Tue Feb 23, 2021 2:10 am
by Lady Fraktor
I expect the view will be quite violet when viewing objects.
A bottom line beginners telescope I would probably not recommend.
At 90mm f/5.6 the level of CA would be difficult to filter out.
Re: iOptron ST90?
Posted: Tue Feb 23, 2021 2:43 am
by ARock
Interesting! I did not know anyone still sold these.
Somehow, in achromats, the ST90 and the ST102 do not seem as popular as the ST80 and the ST120.
In other news, I see that the Meade Adventure ST80s are back in stock on Amazon.
Re: iOptron ST90?
Posted: Mon May 31, 2021 1:27 pm
by John Fitzgerald
This seems to be the same as the original Orion ST90. I had one. It was best for terrestrial viewing, although I used it stopped down a bit to project the transits of Venus to good effect.