Clive if you read the line above it indicates that the RC12 has a STL11 on it. Guiding is through a QSI OAG. How does a QSI OAG go onto a STL11?
If you knew about imaging you would know what each of these pieces of equipment are. BTW where are your images?
Look this thread is really about the new RC16 and it is clear you and Mark have some beef against these RC scopes or feel the need to have a go at them. So why bother to hijack the thread? It completely disrupts the thread and puts off people who are interested in buying one of these scopes. Why not just let us discuss the scopes?