I'm currently testing out a Lunt 102mm f/7 with a Burgess24 binoviewer on a Stellarvue M2C manual AltAz mount sitting on a Velbon 830CF heavy-duty carbon-fiber photo tripod. Setup is easy, motions and controls are smooth, and the mount handles the weight without a worry on my end.
As-a-whole, while binoviewing, the setup is extremely stable with only a small-frequency, ever-so-tremulous, micro-quivering vibration noted at high powers (mostly over 150x) when the focuser end is touched or bumped.
Of note, there is almost none of this minute vibration (barely-perceptible to non-existent) without the added mass and moment arm of the binoviewer setup while monoviewing at the same magnifications. So, clearly, the binoviewing setup needs some troubleshooting and working/ironing out, my suspicion here is center-column play (extended vs. non-extended).
I'll be trying out mounting the M2C + scope on a non-center column tripod to compare the differences, but then leg-clearance while viewing near the zenith will become an issue. So I'll be curious to hear how your Manfrotto 475B fares.
As for binoviewing with the scope (the following views from a lifelong Dobsonian/Newtonian observer) this, um, "little" scope surprised me in the moon and planet views it presented! I've had the opportunity these past two weeks to check out the Lunt scope (for moon and planets) with the following EPs...13mm, 9mm and 3.5 Nagler Type 6, 7mm and 4.8mm original Naglers, 5mm, 4mm and 3mm Delites, 4mm Vite, and 3.2mm Paradigm (54.9x through 238x)...just to see where the image would/might breakdown. My "surprise" here...it never did!
Under Pickering 6-7 seeing...
Courses in Astrophotography: The Pickering Seeing Scale.
Monoviewing...yes, even the diminutive 4mm Vite and the (recently-purchased just for this test) Paradigm 3.2 and the Delite 3mm provided serviceable (though, still atmospherically troubled) views of the near-culmination Mars with the Delite providing the best contrast view and darkest background of the three and Paradigm supplying a uniquely crisp planet rendition different than the Delite. (The moon, Jupiter and Saturn were too low from my northeastern skies for any satisfactory views much over 150x).
Binoviewing...the Lunt did not allow enough in-focus for non-Barlowed Burgess24 binoviewing. Using the aforementioned 9mm Naglers, along with the Burgess 1.95x Parfocal Barlow, provided fabulous ~155x views of all 4 test targets (Moon, Jupiter, Saturn, Mars) even the one's stuck down in the atmospheric soup! The previously mentioned images vibrations were noted with my Barlowed binoviewed 7mm and 4.8mm Nagler pairs (though some vibrations perceived with 9mm pairs). The binoviewed image with the 7mm's was as acceptable as the monoviewed images noted above though I'm now convinced that I need a pair of N7T6's as their 12mm of eye-relief will provide some small relief over the 10mm eye-relief of the original Nagler 7's. The 4.8mm binoview was a, um, "bridge too far".
Not what I'm used to observing these targets with my C9.25, or my 14" Dob (read: resolution and image brightness at higher magnifications), but...surprise, surprise surprise, this, um, "little" Lunt is going to make a great gift for my daughter (for whom all of this above testing was done! )!