I have used the 322RC2, on a Manfrotto 682B self-standing monopod,
with Pentax20x60 & Barska 30x80 binoculars over the years,
mainly for bird watching.
The 682B has three retractable legs which makes it more versatile overall,
at least for me. (stability)
You should be fine using your Celestron 15x70 binoculars.
The 322RC2 is rated for 11 pounds of weight.
You will need to experiment with the friction drag control.
The 679B can support 22 pounds of weight.
Just make sure that you snug the screws & nuts for the leg releases.
You don't want it to collapse on you without warning.
In the past, I have used my 322RC2 both horizontally & vertically with high
magnification binoculars successfully.
The Manfrotto 322RC2 comes with a removeable floor plate and also
a small allen wrench for adjusting tension on the ball.
If it does not come with an allen wrench you can always buy one at a
hardware store, etc.
It wouldn't hurt to ask if they still have the "instruction sheet" that came with
the 322RC2 ball head. Worth a try.
Edited by hallelujah, 06 December 2018 - 05:33 PM.