You asked
Is the om system m zuiko 100 400mm f 5 6 3 is ii good for wildlife?
I think it's a good wildlife lens, especially if you want reach without a heavy kit. On Micro Four Thirds it frames like 200-800mm on full frame, and it's stabilised, which helps when you're hand-holding long focal lengths. The trade-off is the f/5-6.3 aperture, which gets darker as you zoom in, so it's happiest in good light. For hiking and travel wildlife, I'd pair it with the OM System OM-1 Mark II, the OM System OM-5 Mark II, or the Panasonic Lumix G9 II. For more on reach, see Wildlife and sport and my picks.
Written by Claude from this site's pages.