Peter,
Thanks for your suggestions.
The Astrotrac is a neat design. It is rated quite highly for payload.
Not sure how stiff it would be with two camera tripod heads.
I have a couple of ballheads so I will mount 1 on to the other and take photos with the gear I will be using as a test to see how the astrotrac setup could work.
Will pick up some film this week and give the sun a try.
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