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Replacing a 4 inch focuser with Feathertouch or Moonlight is going to be expensive - I've just done it with my TOA-130. Nonetheless, the new feather touch focuser is an incredible piece of machining. I had a Moonlight focuser on another scope, albeit with a Servo motor (not an absolute position Stepper Motor), and wasn't impressed. I much prefer the rack & pinion mechanism of the Feathertouch.
If the stock focuser is satisfactory, a robofocus will be your cheapest option. You can buy a feather touch motor that attaches to a Tak 4 inch focuser - not sure about other brands. Might be worth an email to Wayne at Starlight Instruments - he was helpful with my enquiries.
As for focusing, Focusmax is your best option once you've got an ASCOM compatible focuser. Version 3 is the no-longer supported shareware version, Version 4 is a commercial product (USD$149). Version 3 still works fine for my needs.
DT
Last edited by DavidTrap; 09-08-2015 at 10:32 PM.
Reason: added a bit
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