Zenith Star 66ED Semi-APO

[Crunchard]

Would this be any good for AP?

[Ben Ritchie]

Not ideal. I have a WO 'semi-APO' and it's a nice 'scope, but in all honesty they're reasonably-corrected achromats, there's nothing apochromatic apart from the whims of the WO marketing department. In particular, they diverge quite noticeably in the red - not so much of an issue for visual as the eye's not very sensitive to the far-red, but certainly so for imaging - so at a minimum you would need to use filters to control UV/IR and even then it's not going to match a real (well-corrected) apochromat.

[Crunchard]

Thanks Ben.

[Ben Ritchie]

The apochromatic ZS66 is nice for imaging though, just i'd avoid the "semi-APO" version unless you're visual (in which case it's a nice lightweight, portable 'scope).

[Crunchard]

I have an ST80 so pretty much the same I'd guess ... although strangely my grab'n'go is my 10" dob