Check this out: Sony A6500 with the Burress 1900mm f/15 lens – sonyalpharumors
JINTU 500mm / 1000mm f/8 Super Manual Telephoto Lens for Sony a7r a7s a7 a6500 a6300 a6000 a5100 a5000 a3000 NEX-7 NEX-6 NEX-5T NEX-5N NEX-5R 3N and Other E-mount Digital Mirrorless Camera
oshiro 500mm/1000mm f/6.3 manual telephoto lens for sony a7r, a7s, a7, a6300, a6000, a5100, a5000, a3000, nex-7, nex-6, nex-5t, nex-5n, nex-5r, nex-3n and other e-mount digital cameras - Walmart.com
Opteka High Definition 500mm / 1000mm f/8 Preset Telephoto Lens for Nikon Digital & Film SLR Cameras - Newegg.com
500mm 1000mm Telephoto Lens Is it Worth It? (VLOG 24) - YouTube
Do Photographs Suck When You Put a Gigantic $80 1000mm Lens on a Sony A6500? Watch the VIDEO | Shutterbug
Amazon.com : High-Power 500mm/1000mm f/8 Manual Telephoto Lens for Sony a7r, a7s, a7, a6500, a6300, a6000, a5100, a5000, a3000, NEX-7, NEX-6, NEX-5T, NEX-5N, NEX-5R, 3N and other E-Mount Digital Mirrorless Cameras :
BIG MIKES ELECTRONIC BM-SLY500SN-K2 High-Power 500mm/1000mm f/8 Manual Telephoto Lens for Sony a7r, a7s, a7, a6500, a6300, a6000, a5100, a5000, a3000, NEX-7, NEX-6,