I have a Celestron Regal 65mm ED, the M2 version, weight about 1.6kg including zoom eyepiece, max magnification I will use it about 70x (ES 5.5mm).
I'm looking for a light, not too expensive and with arca-swiss clamp mount. I already have a 15cm Arca Swiss dovetail to balance the scope (it really needs 15cm as this Regal is very back-heavy). Dual use, nature and sky.
In another discussion someone said
If your spotting scope has a collar ring that can be rotated by 90 degrees then a 36-44mm Arca-Swiss ballhead used in alt-az config (rotated into the notch) is solid and cheap.
which is something I never tought about (ball heads are generally considered not good for moving targets, but the idea or rotating the spotting scope to change the balance point in order to use a ball-head as a fluid head is new for me).
IHF said in the other discussion
I assume to mount the 80mm Regal (not 100mm)?
Yes, I mean the diameter of the ball. The Sirui K20X (38mm) and K30X (44mm) are very solid and basically the references for Asian made ballheads. Unfortunately a bit pricey and the K40X a monster (too large for you). Searching on Italian Amazon this mid price option looks to have a 40mm ball while this a 46mm. You really don't need huge ballheads as long as they are stable enough to hold the scope and not drop it. There are no strongly levered forces in alt/az configuration, everything is very simple and central. A high quality smaller ballhead is preferable over a larger not well made one. There are 36mm ballheads in the EUR 20-30 range. Maybe you can borrow a ballhead and try it first? I would not trust a koolehaoda E2/E3 though (as they show in my searches) - they are weird and too cost reduced, even though they have large diameter balls. Finally, depending on the size of the eyepieces that you are planing to use you may want a longer than default 60-70mm Arca-Swiss plate, say 100-150mm, to balance the scope with different eyepieces better.
Suggestions? Thanks. Yes, eventually I can order on Amazon and return the mount if not satisfied.