I asked before about R7, I don't remember where, but people just suggested me to go for R6 or R5 that time, so I assumed maybe it is not a good camera to have, and they pointed cons over pros, I asked about it because of the crop factor precisely, when I shoot sports with my 1DX and 300mm I always crop, ALWAYS, even with 1DIII which is APS-H, but the quality cropped from 1DX was amazing, but not much from 1d3, so that I want to upgrade from 1dx and 1d3 to latest mirrorless, even with crop they will outperform those old dslr cameras, R5ii will be 1dx replacement, and I will wait more for R7 upgrade to be like 1D3 replacement.I'm not a birder, but several friends of mine are pro birders. I use almost the same equipment for sports photography.
You will see a lot of what I respectfully refer to as "gear snobs" recommending the most expensive bodies Canon has to offer. They mean well, and those cameras are certainly awesome. Who wouldn't want an R1?
But, it's my understanding that an APS-C ("crop sensor") camera body is best for birding and wildlife in general strictly because of their reach. So you don't disturb the birds you're hoping to photograph, it's probably best to be as far away as possible while still producing tack-sharp prints.
For example, if you're using a 300mm full-frame lens on a full-frame camera, you're only going to have 300mm of focal length. But, if you put that same 300mm lens on an APS-C body, you're extending the reach of that lens by about 1.5x. So, instead of 300mm, with an APS-C body and the same lens, you can now reach 450mm without losing clarity.
That being said, from what I understand, the best APS-C camera from Canon is the EOS R7, which is expected to receive an upgrade to the EOS R7 Mkii in 2025. This camera's crop sensor, high shutter speeds, in-body Image Stabilizing and moisture-sealed body help make the R7 the perfect birder without breaking the bank. I currently shoot all my sports photography on an R7 primarily because of the crop sensor, and I love it.
I hope this helps.
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