Steve Spencer
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 p.1 #4 · Sony 100-400 f/4.5 or Canon 100-300 f/2.8 | |
Perhaps I can help you think this through. I shot Sony for about 10 years until a few months ago, and I currently switched to Canon (I shot Canon DSLR for about 10 years before switching to mirrorless Sony). Wildlife isn't my primary focus but it was one of things I wanted to be able to shoot.
Here are my thoughts. I think you want to get at least one new camera no matter what lenses you decide to buy. The A7r II, which I owned and liked for many years is not well suited at all for wildlife. It doesn't have very good AF and it doesn't allow burst shooting well at all. And the A7CR has a great sensor and better AF, but doesn't allow very good burst shooting, silent shooting, a deep buffer, or precapture. On top of that it is a pretty small camera to be using for long lenses and has a weak EVF.
On the Canon side, the R7 is more capable (I currently own one), but is APS-C, has a loud shutter, and slow sensor scan speed in electronic shutter mode. It can be used for wildlife but has limitations.
So, here is what i would have done if I stayed with Sony and we in your shoes. I would get a used A1, for the fast silent shutter, good resolution, the great AF, the great burst rate, and it excellent EVF. It is missing one feature, precapture that would matter to some, but I wouldn't want to fork over the several thousand dollars to get that with the A1 II. Then at this point I would add the 100-400 f/4.5 GM and the 400-800 f/6.3-8 G lenses and call it a day with a great kit for wildlife. If I had a bit more money, I would swap out the 100-400 f/4.5 G for the 300 f/2.8 GM and a 1.4X TC and 2X TC. That lens is pretty small and pretty amazing and works really well with both TCs
My plan for Canon, however, in the long run is to use my R5 II (which is a great camera) with the RF 100-500L, which you already have and RF 200-800 f/6.3-9. I might decide to spend more money and get an EF 500 f/4L II to get better performance in lower light, but that costs as much as the other two lenses combined.
Comparing the two kits the Canon kit is considerable smaller, lighter, and cheaper, but has a bit less capability. For me personally, when wildife isn't my focus i think I will be happy with the Canon kit. I think both system are excellent and you could reduce the cost of the Sony kit by going with the 200-600 f/5.6-6.3 G instead of the other two lenses but that would still be a pretty big lens. Either way, I think either system could serve you well and depending on just what EF lenses you have to sell you might have some real resources to build your kit. Both kits have excellent AF and both kits would seem to be very capable for what you want to do. Nevertheless there will be a tradeoff as always between size, capability, and price.
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