The Celestron 11" Dovetail Bar is 11" in length and is built specifically for the Celestron C11 OTA. The Celestron 11 Inch Dovetail Bar is compatible with the Celestron CGEM Mounts and the Celestron CGE Pro Mounts.
Will this bar fit on a NexStar 11 inch GPS telescope? I think I need 4 screws and this seems only to have three (the picture says it is for a c8 telescope - so the picture is wrong.)
it does fit.
Is this what I need to mount guide scope ?
This is the wider dovetail bar which works well to mount your OTA to your mount. You may want the narrow bar to mount on the top for guide scope. The clamp or saddle size will be matched to the bar you choose. This works well so you can move the guide scope and other stuff in relation to the OTA.
I hope this helps.
Is this dovetail compatible with the CPC 1100 Edge HD?
TRACI D A
I got it for my 1100 Edge HD optical tube (German Equatorial mount) and it worked no problem. It has multiple screw holes and one is longer for flexibility.