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Barry,
Yep, the Robofocus is the mechanics, consisting of a motor which attaches to the focuser shaft, a mounting bracket, a control box and software.
What scope would you be attempting to automate? And, what imaging rig would you be dangling off the back?
There are better options than the Robofocus (it was the staple focuser for a STL/FSQ combinations as it could take the weight and took no precious backfocus), such as the FLI Atlas/PDF and the Clement focusers. Starlight's Feathertouch and Moonlite also make great automated gear.
The better alternatives are also more expensive. The Atlas is $3,200 at BinTel. Robofocus or the newer Sharpsky are about $500.
H
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