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 :
Sony Alpha DSLR-A500 Manual Focus High Power 1000mm Lens - Walmart.com
Opteka 500mm f/6.3 (with 2x- 1000mm) Telephoto Mirror Lens for Digital
Opteka High Definition 500mm / 1000mm f/8 Preset Telephoto Lens for Nikon Digital & Film SLR Cameras - Newegg.com
Camera MF Super Telephoto Zoom Lens F/8.3-16 420-800mm T Mount with Universal 1/4 Thread Replacement for Canon Nikon Sony Fujifilm Olympus Cameras | Wish
Jintu lenses JINTU 500mm/1000mm f/8 Telephoto Lens Manual Camera Lens for DSLR C | eBay
Opteka 500mm/1000mm High Definition Preset Telephoto Lens for Sony Alpha A99, A77, A65, A58, A57,
300mm F8 Super Telephoto Lens for Sony A6500 A6400 A7 A7RII NEX-7 E-Mount Camera 653858269084 | eBay
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
Andoer 500mm/ 1000mm F/8 High Power Camera Telephoto Lens Manual Focus For Nikon D40 D40x D60 D90 D100 D200 D300 D500 D600 D610 - Photo Studio Kits - AliExpress