Impossible to get to 55mm backspace, even if you look at the ZWO backspace "best solutions" manual I can only get to 58mm.
here's the setup 16.5mm + 2mm (T2-T2) + 20mm EFW + 2mm (T2 -T2) + 17.5mm ASI2600 = 58mm
even if I "float" the 16.5mm to the EFW using 0mm adapters = 56mm, but this is not a solution as cannot lock down the 16.5mm.
The "best solutions" manual shows the EFW going directly to the camera but this is impossible, but if it was possible it is still 16.5+2+20+17.5 = 56 not 55 as the manual shows. the manual is incorrect.
Any help would be extremely appreciated.
