It is a cheapie GSO 0.75x FR from Bintel (
https://www.bintel.com.au/product/bi...5x-rc-reducer/) I just want to know that I'm putting it in the correct position in my imaging train to start with, and what impact it has to my backfocus calculations...
Googling has shown nobody posting a "This is how I'm set up" images ANYWHERE... this implies it is so easy it is considered basic knowledge, but given I've never managed to make it work, I'm asking the embarrassing question