A top loading fluid head has more imbalance and deals with it by friction.. fluid friction. Properly balancing a scope may take some creativity, stock dovetails etc, don't always cut it.
With a 90 mm Mak, there are no heavy eyepiece's..
In terms of photo tripods, I am not talking about department store tripods. I'm talking second hand Bogen/Manfrotto heavy duty tripods. I find these on Craigslist etc. The tripod on the photo is a 3046 with a 3047 head. New this would be around $500, used, under a $100.
My favorite mount for a small Mak is the Vixen Portamount.
Sure, you could piggyback a longer dovetail onto the short dovetail on the C90. But that adds weight and length and unnecessary cumbersomeness to what should be a light and compact grab-n-go scope. I wouldn't do it.
What works better is to attach the C90's short built-in dovetail to a moderately long quick release plate. Here's one. https://www.bhphotov...ting_Plate.html (IIRC, mine was another brand and less expensive.) This slips onto the top of the fluid head. This way you can set the C90 farther forward on the head without dealing with a long and heavy piggyback dovetail.
Of course, you should put the fluid head on a decent tripod. Bogen/Manfrotto. Vanguard makes some decent tripods. An elevator column is a nice addition. It doesn't need to be geared. The kind that you can release and move up and down by hand is good enough for a small scope.
I'm basing all this on my own field experience with a 501HDV fluid head versus small side-saddle heads such as a DwarfStar and MicroStar. For me, when observing with a C90, a fluid head provides a more enjoyable experience and smoother movement than the side-mounting heads.
I think the Portamount or Voyager is more than is needed for a C90. That's like having a mouse ride an elephant ... or at least a horse. If I were to bother taking out my Voyager mount, I'd probably have the C6, 6" short tube Newt or even EdgeHD 8" on it, not the C90.
Edited by Sarkikos, 22 August 2019 - 10:29 AM.