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Hi Chris,
I have the Vixen Spinx Sxw (the blue one).
It looks good and it is very portable. However it's tracking is not very good. Unguided, I am lucky to get decent 30 second exposures. I also have a Skywatcher HEQ5 Pro with which I can get good 2 minute unguided exposures.
The Vixen also has very bad DEC backlash. You have to set the DEC backlash compensation to 80% or even 100%.
Vixen Japan has told me that this is normal!
However, on the plus side, when I autoguide I get perfect 10 minute exposures and I'm sure I could extend this to 20 minutes without a problem. This is much better than the HEQ5 Pro.
Good luck.
Ross
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