|
You are using a SCT there is absolutely no comparison. There shouldn't even be any discussion, If you want to do any longer exposures that you will require for dso imaging you need to use an OAG. SCTs mirrors move to focus, and thus also move or "flop" as the telescope tracks, a guide scope attached to the tube will not pick up this mirror movement and you will end up with stars that are not round. An OAG should be able to compensate for this movement and you should get round stars.
|