Gene51 wrote:
A long zoom won't get you what you want. Most of the image degradation is due to atmospheric conditions - haze, mist, fog, heat shimmer, etc. You could spend $20,000 on a lens and full frame camera and not be at all satisfied. Good luck with your quest . . .
On rare days the air might cooperate to give you acceptable pictures if you are careful with a more suitable camera and lens. Gene51 is correct, as usual. A long lens won’t get you any closer. It can only give you more magnification of what you see from where you are. On certain days you might even work the atmospheric effects into the composition.