Interested in folks opinion here. I wanted to try guiding my C9.25 with a longer focal length tube, so I switched from a piggy backed 80mm refractor (focal length 480mm) to a Meade DSI to 127 mm / 1500 mm focal length MAK into a Meade colour DSI.
One problem is now stars are huge! Rather than be near pin point for example Canopus last night via PHD on a 3 second frame grab cycle was about the size of a pea! Say 3-5 mm across. I am not convinced PHD can find the centroid of this star accurately - especially as atomspheric effects kick in.
I am really trying to nail autoguiding better - so any suggestion would be much appreciated. The mount, Losmandy bars etc - have the capability and rigidity, its a permamnent set-up - so my next target is a CCD better suited to the 5" MAK.
All thoughts and suggestions greatly appreciated!
http://ccdware.infopop.cc/eve/forums...t_rear_all.jpg