You asked
Is the sony a9 good for wildlife?
Yes, the Sony a9 is a good choice for wildlife and sport. It's a 24.2-megapixel full frame mirrorless body built for fast action, and it's now a used bargain. The hard part is reach, so the lens matters more than the body. Here are three telephotos that fit it:
- Sigma 300-600mm f/4 DG OS Sports if you want the most reach and the fastest aperture in the list.
- Sony FE 200-600mm f/5.6-6.3 G OSS if you want Sony's own zoom and a lighter setup.
- Sigma 60-600mm f/4.5-6.3 DG DN OS Sports if you also want to shoot wider subjects with one lens.
Used lenses hold their value well, so trying a long lens is cheap. See wildlife and sport and what holds its value.
Written by Claude from this site's pages.