Another title for this post could have been what zoom EPs do you use with your halpha solar scope?
My limited current understanding is that it seems most zoom EPs aren't parfocal but the mm difference that creates the discrepancy is so small that most people dont notice the difference. Hence why some people say one pair of zooms is not parfocal while other say their's are parfocal.
I've only seen the orion pro lanthium zooms as explicitly marketed as parfocal. And saw it claimed on here that Leica and TV Nagler zoom EPs are also parfocal. While the Hyperion Baeder zooms are and arent for some people but technically are not.
And so with regard to halpha solar scopes i've seen others say that they have to continually readjust their halpha scope because it goes out of focus on the zoom EPs?
So what zoom EPs in binoviewers is everyone using for their halpha scopes?
Thanks. Clear skies.
Also bonus question, at what mag or focal length EP do you notice the image going soft? (State your apeture)
Edit: Found this thread
Looks like the need to make adjustments is pretty common.
Edited by iseegeorgesstar, 10 August 2020 - 06:03 PM.