[Wavytone]

All, I'm off to the US for the eclipse and looking for a refractor that can do duty as a telephoto lens (aiming to record the eclipse in 4K video with an m4/3 body) and ideally be a nice visual scope later. Looking for a focal length in the range 480mm - 600mm.

So... does anyone here know anything about the following scopes which are my shortlist:

1. Stellarvue SV70T - its an ED APO triplet, 70mm f/6 420mm fl which is a tad on the short side.

2. APM Imaging Star 70mm f/6.78 475mm fl, ED triplet APO + a corrector internally;

3. APM TS Photoline 80mm f/6.25 500mm, ED APO triplet again;

4. APM TS Photoline 90mm f/6.6 600mm, ED APO triplet again.

The APM optics are evidently from SharpStar in China.