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Hi Bob,
The 70mm is a Skywatcher 70x900 so a focal length of f13 or close to. I think I stated earlier that there is no visible CA in this scope. Sirius did show up with the slightest purple haze out of focus all of which disappeared when in focus. Eyepiece for this is a UOVT 6mm which gives 150x (University Optics Volcano Top) I did try a 19mm Panoptic with a 3x ES focal extender
(Powermate)...there was no difference in the image.
I could see 2-3 diffraction rings around the Star which I think means that was too much mag for the conditions, as nice a sight as it was. Didn't think to try some other longer FL eyepieces, next time.
Used two mounts and EQ3 with tracking which is a great match for the 70mm and also my old pillow block EQ which also has tracking.
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