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Hi,
The SW focuser (or any electric focuser) just makes life so much easier, you can look at the laptop screen with a zoomed in star and get the best FHWM figure. You could never achieve this turning the focuser knob manually unless you had your laptop right next to the scope.
Plus the critical focus zone for astro-photography is determined by the formula
CFZ = pix size (microns) x Focal ratio ( e.g 5 micron pixels and F5 scope is 25 microns), your fingers would never get that accuracy turning the knob.
P.S. I ditched the 9V battery in mine and run it off a 12V power pack.
Cheers
Bill
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