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Check out our HUGE wildlife lens review:    • $600-$2,000: 10 Wildlife Photography ...  
Tony & Chelsea Northrup search for the greatest wildlife camera at three different price points: $1,000, $2,000 and unlimited. They tested the greatest cameras in each of those brackets and narrowed it down to 1 mirrorless camera and 1 DSLR in each of those brackets:

Under $1,000: Sony a6400 vs Nikon D7500
$1,000 - $2,000: Fujifilm X-T4 vs Nikon D500
Over $2,000: Sony a1 vs Nikon D850