Hi Den, as discussed, here's a
quick presentation I put together that may be relevant to SCTs collimation. In my view there is no bad scopes. Just scopes needing a bit of mechanical tweaking now and then to get the best performance out of them. What you pay for in premium products is the time and attention spent but the manufacturer in putting the rigs together in a nicely engineered package. I don't think nowadays there are any really
bad optics being produced out there but mass produced scopes lack in QA . Sometime you get a
bad one.