900mm F8 Large Aperture Telephoto Mirror Lens with Adapter Ring for Sony NEX Mount Mirrorless Camera, for Shooting Birds and Wild Animals: Amazon.co.uk: Electronics & Photo
Canon PowerShot SX260 HS - Review 2012 - PCMag UK
Canon IJM663 | 900mm x 25m
900mm F8.0 Camera Telephoto Manual Prime Mirror Lens+2X Teleconverter+T2 Adapter for Canon Nikon Pentax Olympus Sony Fuji DSLR - AliExpress
900mm F8.0 Telephoto Mirror Lens - Super Telephoto Mirror Camera Lens - Alloy + Optical Glass - for AI Mount - for Nikon SLR Camera: Amazon.co.uk: Electronics & Photo