Tech@ZWO Sorry, a typo, I mean ZWO EFW 2". The scope in question is the SharpStar Hypergraph 15028HNT-AL. I think I may have a solution for my setup:
Adaption Sharpstar HNT15028 with ZWO CAA + ZWO EFW 2" + ZWO ASI2600 MC Pro 26MP
Hypergraph NT15028: 55,0mm
M48 Fine Tuning Ring - 01.0mm
ZWO M54-M48 Adapter - 00.0mm https://www.zwoastro.com/product/m54-m48-adapter/
ZWO CAA M54 Male - 16.5mm
ZWO EFW 2" - 20.0mm
ZWO ASI2600 MC Pro 26MP:- 17,5mm
-------------------------------------------------
Total: 00,0mm
Does this sound reasonable?