By JMI Focus Pal do you mean something similar to a FCUSB or is the JMI unit offering a more controlled focus?
The problem with DC motors for focus i have found is overrun unless the motor speed control can be set very slow or there is a braking mechanism. But overall ,with the celestron speed adjustable handcontrol , the function is quite good if not repeatable.
Using occasional refocus with a bahtinov mask, I have got much better at manual focus.So much that the motor focus gets less use. Or perhaps it is simply steadier with the scope bolted to a pier and tightening up the mount.
Quote:
Originally Posted by Merlin66
Tony,
$100....
The DC pulse control under JMI Focus Pal works pretty well - check it out.
It really depends what you want to do - focus the scope or compensate the changes as you go....
|