[Paul Haese]

I have come to an impasse with the GSO RC12. The back focus currently allows for a 3" rotator and an Atlas focusor with 52mm of spare backfocus. Original back focus is around 280mm. The STXL with integrated filter wheel takes up 61.87mm of that original figure.

Now to the core of the problem. If i buy a 4" flattener from ASA the adapters and flattener take up 108mm after the metal back distance is taken into account and adapter depths allowed for in the equation. So that means i cannot have both a flattener and rotator within the system.

So my question is, is it better to have the rotator (bearing in mind I am doing automation) or is it just better to crop out the frame for each image? Both seems problematic to me.

Guys doing automation and with similar imaging systems will most likely have an idea of what will work better.