Hi there,
I am in Australia and notice a number of people have this combination of scope and camera so the answer to my question to achieve the 25mm back focus required of the RASA 8
The Camera came with 3 spacers with different threading either end except for the 11mm attached already to the camera and with the same thread throughout, a T2-M48 16.5mm extender and a 21mm extender.
If I left the the 11mm connected adding the camera back focus of 6.5mm accounting for 17.5mm of the target overall back focus of 25mm would I need a 7.5mm extension to complete the requirements and with what size threading.
If not what combinations have other uses used to achieve back focus.
Thanks Scott