I'd pick the TV-76 but that's because I understand the TV approach to astronomy. I don't know what the heck Takahashi's approach is. Seems like you have to buy extra stuff to run their scopes.
Not sure that is true.
I see the TV85 at many sites and all it includes is the OTA and a soft case. So no rings, not diagonal, no finder. Cost $2125.
I see the FC76 at many sites and it is just the OTA. So no case, no rings, not diagonal, no finder. Cost $1780.
So for both one is going to have to get a diagonal, rings, and finder. Tak also need to get a case. In the end likely not to be much of a difference and the Tak will be about $200 less after you get the case for the Tak. Actually if traveling the case the TV85 comes will will probably be no good as would want a hard shell case, so more like overall the Tak will be $300 less instead of $200 less. But it is a smaller aperture.
Now if thinking the TV76 vs. FC76, well that TV model comes with nothing as well except the soft case for $1695. But actually a little cheaper than the Tak. But it is f/6.3 too instead of f/7.5 which means will need better corrected eyepieces whereas most any eyepiece will work well in the closer to f/8 Tak. TV76 will get you about a degree more TFOV though, up to 5.5 degrees with 40mm wide field, whereas the Tak will get you 4.6 degrees. Both of those binocular-like TFOVs so either expansive. Easier of course to get to high magnifications without Barlow with the Tak.
As far as robustness...makes me wonder how people treat their scopes. I've had my TSA for 6 or 7 years now and take it places and not a scratch on it. And after zillions of objective cap on and off not a single chip on the paint at the leading edge of the dew shield...something I see a lot on other premium scopes after a little time. No dew shield sag and not one iota of slop in the focuser after all that use (my most used scope), no internal flocking sag or black light suppression paint chipping and falling around, not a stick of ware on any of the paint or any anodization fading (can't begin to tell you how often I see that on some other premium brands). For me has shown itself to be quite durable...especially in the places it counts the most, the mechanical moving parts, the collimation, internal baffling integrity.
The OP already has an FC100. An 85mm will be more competing with the 100 than complimentary. For that alone if the aperture and carry size fits the bill for their travel needs then I might lean toward the 76. My recommendation to the OP would be to make an 85mm mask and a 76mm mask for their FC100 and experiment with the masks to make sure which aperture they will be most pleased with for their travel...then go from there.
Curious, does anyone know if either scope can use a binoviewer without an OCA? Small scopes with their big TFOVs are a blast when the binoviewer does not need an OCA/GPC/Barlow to come to focus.
Edited by BillP, 26 September 2018 - 07:46 PM.