Herbie
Rendezvous Conspirator
Yeah, when we upgraded from my circa 2006 Nikon D40 + Tamron 18-270mm, we looked at an FX body, but the weight & size would have been too much for my wife.
So we settled on the Nikon D5600 + Nikkor 200-500mm. We only use the big lens on safari, otherwise we have a Nikkor 18-300mm for everyday use, works very well.
Yeah, we started very similarly - D90 + the same Tamron, but I started realizing I was leaving the kit at home some times because of size/weight - I switched to Micro 4/3 and it carries like a rangefinder, but shoots at least as well as the DX whenever the light is decent. (Small sensor is unhappy doing Astro shoots). I'm sold on the size, sensor-stabilization, and weather sealing, so it'd be a stretch to go back.
I could definitely rent some huge glass if we were doing Safari, but I also think I've got access to enough F-mount stuff and a speedbooster-adapter that I could hit similar focal lengths and apertures as your shots with my current kit. Thanks for sharing!