I had the Sony DEV-3. Pure, unalloyed garbage. I doubt the newer models are any better.
Not necessarily. My casual birding camera is a Canon Rebel SL1 with a EF-S 55-250mm f/4-5.6 IS STM lens. This is equivalent to 2x-8x magnification range, and very lightweight. About 80% of the quality of my old "serious" rig (Canon 5DmkIII + EF 70-300mm f/4-5.6L IS USM) or my new one (Fuji X-T2 with XF 100-400mm f/4.5-5.6 R LM OIS WR and 1.4x TC).
You can even get lightweight ultrazoom cameras like the Panasonic ZS60 (poor in low light) and ZS100, and for better quality the bridge ultrazooms like the Sony RX10III, Panasonic FZ2500 and Canon G3X.
Ideally someone would come up with a fixed-focal 8x camera using folded annular optics, which are way more compact than conventional lenses, but the decline in the camera market has starved R&D for niche products.
Fazal. Happy to bow to superior knowledge.
What sort of ballpark money would one be looking at for these various configurations?
The OP may like to know for future reference and I'm kinda curious myself.
The principle of a good quality nature-geared optical system which permits 'capture' for later evaluation in a portable(ish) format may indeed be niche now but what's the old saying?
'Build it and they will come?'
There could be a much larger leisure market just under the surface.
My instinct is that this, as you demonstrate, is rapidly approaching that point of coalescence in terms of digital technology,form factor and price.
These things can often find their way to market as hand-me-downs from military tech e.g. Gps, Arpanet, gore tex and so on. I heard that Angenieaux used to make tank scopes at one point (although I'm not sure if that is indeed true). I have little doubt that there's a lot of cross-fertilization under the umbrella of a specialist optics company.
My glasses have stepless Nikon progressive lenses. Distance, computer screens and reading all in one but for the shifting of an eyeball or subtle tilt of the head. Multicoated, thin, lightweight, CA corrected and photochromic. Frankly remarkable technology imho. And here's the rub - almost certainly in the realms of a fairytale at consumer level ten years ago.
(Apologies to OP for rambling and side tracking. I'll watch this one from the sidelines from now on. Thank you for letting me participate. Hat, coat, gone:flyaway
Tm