70-200 f2.8 is a brilliant starting point - if I had to keep just one lens ...
For UK circuit work. having happily used a 200-500 super zoom for a while, I have now moved to two Nikon PF lenses - 300mm prime and 500mm prime. PF is Phase Fresnel and means a shorter, lighter lens. Both can be used without the monopod that the superzoom rather demanded. Note, it's not a cheap route to take.
Using 1.4 and 1.7 teleconverters, I have rarely found myself without something close to the right lens. The D850 has such big files that a small crop doesn't really impact.
I have been using a 24-120 f4 zoom at hillclimbs from time to time and it also makes a good paddock and pit walk lens. My least used lens currently is the 24-70 zoom.
Finally, for LM this year I used an entry level DSLR and kit lenses (18-55 and 55-200) - much easier to carry round !
|