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Lets clear up a bit of the nonsense that is going around concerning the drives of Losmandy mounts.
I have both a GM-8 and a G-11 and the fact is, I have never had a drive problem. Drive problems that are reported are user caused and the main cause of that is balance or the ability of the user not to be able to balance their system in 2 axis or in the case of side by side mounting, 3 axis.
My GM-8 has the original stepper motors and the mount is some 9 years old now, I run an Argo Navis with DSC's, the stepper motors have significantly more torque than you will ever need and do indeed tolerate quite an amount of imbalance.
My G-11 is fitted with a Gemini unit, on the new mounts you have 2 options, either the standard servo motors or the new Maxxon high torque motors. Problems are caused by users not properly balancing the load, so a properly balanced load will have almost no effect on the drive motors, that said, the standard servo motors are more than up to the job with the mount properly balanced, the Maxxon motors are that much better.
As to your question, I have never used a Vixen mount so I can't comment, I have used the GM-8 and G-11 for a long time now and the GM-8 with the G-11 tripod carries my Takahashi TSA-102 as a field mount with absolutely no problems at all.
Cheers
JohnG
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