You asked
What is the canon rf 200 800mm f 6 3 9 is usm good for?
The Canon RF 200-800mm f/6.3-9 IS USM is a reach lens for wildlife and sport. It's stabilised, autofocuses, and covers 200-800mm on full frame. On an APS-C Canon body it frames like 320-1280mm. The catch is the aperture: at f/6.3-9 it gets darker as you zoom in, so it works best in good light.
For birds and distant animals, you want 600mm and beyond, so this is the kind of lens the wildlife and sport guide has in mind. Pairings I'd consider:
- Canon EOS R7: APS-C, so it gets the most reach from this lens.
- Canon EOS R6 Mark III: full frame, a sensible all-round sport and wildlife body.
- Canon EOS R5 Mark II: full frame with more resolution, if you can justify it.
Long lenses hold their value, so buying used can save a lot.
Written by Claude from this site's pages.