Precision308 wrote in post #19190890
I'm interested in some wildlife photography. I have a Sigma 150 to 600 contemporary lens right now. It seems to do pretty well but I hear that the prime L series cannon lenses seem to do better. The camera I'm using is a 6d Mark II. I've considered buying the 90D to have a crop sensor. My question is if I can find a used canon 400mm f5.6L would it be worth it for wildlife photography. I know that it is an older lens but over the years there seems to have been a lot of reviews and they all are very good. When I talk wildlife mostly deer some birds and just other small critters.
If your goal is not fast moving where you need the best AF lens you can, then don't worry about the 400L F5.6, it's a good lens, but its not some incredible piece of kit (unlike the 400mm F2.8L which is incredible). It's a fairly old lens. It's not really better than what you have other than its AF speed. But shooting deer, you don't really need crazy fast AF. Small birds and small critters scream for focal length, so the 600mm you already have is likely the way to go.
So not really an upgrade all around, more of just something "different."
I would argue instead, shop for a used 300 F2.8L IS instead. That's a better lens, more versatile and has blazing AF without being ridiculously huge. Takes TC's really well. Then you have a nice 300 F2.8, 420 F4 and 600 F5.6. Or, hold out for a 500mm F4L which is also an incredible lens.
Very best,
