There is a lot of these lenses online, this is where I got mine from https://www.amazon.co.uk/gp/product/B073X4RRWP/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 at the time of this video, it is currently unavailable, this is an alternative link – https://www.amazon.co.uk/Walimex-Pro-650-1300-Pentax-white/dp/B001UAIERU/ref=sr_1_24?s=electronics&ie=UTF8&qid=1536498221&sr=1-24&keywords=650-1300+mm+lens
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Opteka 650-1300mm f/8-16 High Definition Super Telephoto Zoom Lens for Canon EOS 80D, 77D, 70D, 60D, 7D, 6D, 5D, 7D Mark II, T7i, T6s, T6i, T6, T5i, T5, SL1 & SL2 Digital SLR Cameras
The Opteka 650-1300mm high definition manual focus super telephoto zoom lens is perfect for the professional and amateur photographer alike. Using a 2x tele-converter with a 650-1300mm lens will effectively increase the focal length to 1300-2... (as of November 16, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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Opteka 650-1300mm (with 2X- 1300-2600mm) Telephoto Zoom Lens for Canon EOS 7D, 6D, 5D, 5Ds, 1Ds, 80D, 77D, 70D, 60D, 60Da, 40D, T7s, T7i, T6s, T6i, T6, T5i, T5, T4i, T3i and SL1 Digital SLR Cameras
The Opteka 650-1300mm high definition manual focus super telephoto zoom lens is perfect for the professional and amateur photographer alike. Using a 2x tele-converter with a 650-1300mm lens will effectively increase the focal length to 1300-2... (as of November 16, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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Vivitar 650-1300mm f/8-16 Telephoto Lens (Black) (T Mount)
The Vivitar 650-1300mm Telephoto Zoom Lens is the perfect option for bringing distant subjects up close, with a remarkable telephoto range at an incredibly affordable price. In addition to the impressive zoom range, this lens also features a ... (as of November 15, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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Thanks for the video, very interesting.