Hey guys,
I am looking at the prospect of attaching a small guidescope to my 12.5" NGT telescope which has a truss type tube.
The first questions is:
For a 1600mm focal length (12.5" f/5), will a 90mm Cassegrain with a focal length of 1250 be good enough to guide with? I have a 12.5" Plossl guiding eyepiece and 2 x Barlow. The guidescope will be something like this:
http://www.telescope.com/shopping/pr...iProductID=367
Secondly, does anyone have any experience attaching a guidescope on a truss tube telescope? This is what my scope looks like:
http://www.flickr.com/photos/johnkaz...7594183210993/
One option is to simply mount the guidescope on a flat piece of good with bolted on guide rings and then "wrap" this around the truss tube and attach or remove as required using a belt system.
The other is to mount the guidescope on the rotating nose assembly on the top of the telecope but as the guidescope will weigh 2 kgs JMI have recommended against this.
Interesting stuff hey. Any advice or thoughts you may have would be welcomed.
John.