SCT focuser. Electric or feathertouch ?

[wasyoungonce (Brendan)]

Well ..I've got my GSO SCT 10:1 focuser.

It needed quite a bit of fiddling to get it right:
http://www.backyardvoyager.com/gsofocuser.html.

It is better now but not as good as I expected..a bit hard to tell as its too smokey outside to try out the C8.

I've adjusted it quite a bit and it feels pretty good now....time & use will tell.

It is obviously not feathertouch quality..and not feathertouch cost as well.

[toc (Tim)]

Originally Posted by wasyoungonce

Well ..I've got my GSO SCT 10:1 focuser.

It needed quite a bit of fiddling to get it right:
http://www.backyardvoyager.com/gsofocuser.html.

It is better now but not as good as I expected..a bit hard to tell as its too smokey outside to try out the C8.

I've adjusted it quite a bit and it feels pretty good now....time & use will tell.

It is obviously not feathertouch quality..and not feathertouch cost as well.

Hmm - I think this site got hacked...

http://www.backyardvoyager.com/index.html

[Damian Couzoff (Damian)]

Originally Posted by AlexN

on my C11 I use a moonlite focuser.. they are not quite a feathertouch, but they are not quite the cost either I find my moonlite to be leaps and bounds over the standard focuser, however I'll probably upgrade the standard focuser to the feathertouch micro in the future also....

SCT focusing can be a BIG pain in the butt.. however once you have an external crayford on it, you'll love the scope to bits..

Alex.

Hi alex, I second that,l have a Bintel 10:1 SCT 2 inch Crayford focuser,on my Celestron CPC 1100-11 inch Schmidt Cassegrain.It only cost $119.I do the coarse focusing with the primary first,then use the fine focus on the crayford,then lock the crayford.l have added a losmandy bottom dovetail,with the special 1 kg counterweight,and balanced to suit,with the Crayford,2 inch quartz diaganol,and my heaviest 2 inch eyepiece in my kit.The crayford screwed straight on the back,l am happy with the crayford and the CPC 1100.Regards damian

[Merlin66 (Ken)]

I have a feathertouch 10:1 on the C9.25 - works great!
For the C11 I fitted a SW motor via a small timing belt to the existing knob - now I can control the focus either from a handcontroller or via USB.
BTW the image "slop" during reverse focusing at f10 is less than 4 pixels!

Also, the CFZ ( depth of focus) for 1/4 wave accuracy on a f10 system is 0.22mm (220 micron) - this should easily be obtained with any focuser.....