How useful are these? I know that when I focus on an object and then someone else looks into the EP, they have to adjust slightly. So, everyone is slightly different right? So what exactly is focused?
Motorised focusers are useful for focusing and not bumping the scope.
When you manually focus you have to wait for the vibrations to stop then check focus again.
With a motorised focuser you can change focus remotely (laptop or hand held remote etc) which causes minimal vibration to the scope.
Motorised focusers are extremely advantageous in astrophotography where you can automate the focusing in the software to obtain the optimal focus.
i.e you don't have to manually focus as all and can have a completely remote imaging system.
Motorised focusers are easier to obtain fine adjustment than by hand.
That's a round about way of explaining it but I hope it sheds some light.
I wouldn't have a telescope without a motor focus, as it overcomes the vibration aspect whilst trying to focus. I use JMI focuser's, as they have a discrete little motor, mounted under the focuser.
I particularly like that I can have two focuser's, as it the piggyback arrangement, plugged into one hand. I am only a visual observer who likes the combination of scopes for visual.
I will be at JMI in May and will be looking to get new focuser's for my new telescopes.
Although, because JMI don't have a focuser for my WO 110 FLT, I may have to get a Moonlite instead.
