I know for many, myself included, FSQ-106 charts are a bit complicated to say the least. Now if we add 645 reducer here things get even worse.
So I've got aforementioned scope with large 0.72x reducer, apparently CCA-250 and KP86003 (?) adapters, as well as wide Canon t-mount. Am I using correct adapters ? (photos attached)
Now if I want to use it with SBIG STF-8300M CCD camera (16.5mm working distance to sensor) and ZWO 7x36mm filter wheel (20mm width) what else do I need ? According to this chart KP86003 adapter has M54x0.75 female thread on it ? And reducer's working distance from the end of it is 56.2mm ?
Also, 645 reducer threads directly into the rear lens group cell, not the focuser. While CCA-250 and all other adapters after it screws ON focuser. Now, how to maintain correct working distance in this case ? Especially when focus shifts over the night.