![Amazon.com : Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 50D, 7D, 6D, 5D, 5DS, 1DS, T8, T8i, T7i, T7s, T7, T6s, Amazon.com : Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 50D, 7D, 6D, 5D, 5DS, 1DS, T8, T8i, T7i, T7s, T7, T6s,](https://m.media-amazon.com/images/I/71ReNs2wYcL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 50D, 7D, 6D, 5D, 5DS, 1DS, T8, T8i, T7i, T7s, T7, T6s,
![Catadioptric Lens: The Catadioptric Optical System Used A Combination Of Lenses Along With Mirrors To Reflect A 360° Field Of View Into The Optics Of The Lens. - Better Photography Catadioptric Lens: The Catadioptric Optical System Used A Combination Of Lenses Along With Mirrors To Reflect A 360° Field Of View Into The Optics Of The Lens. - Better Photography](http://www.betterphotography.in/wp-content/uploads/2012/04/Catadio-Camera.jpg)
Catadioptric Lens: The Catadioptric Optical System Used A Combination Of Lenses Along With Mirrors To Reflect A 360° Field Of View Into The Optics Of The Lens. - Better Photography
![Panagiotis Xipteras on Twitter: "The big baby has arrived😎 A #Samyang 800mm f/8 #catadioptric lens is now waiting for the stars.#telescope #astrophotography Fat is beautiful https://t.co/GCYzoV1CjU" / Twitter Panagiotis Xipteras on Twitter: "The big baby has arrived😎 A #Samyang 800mm f/8 #catadioptric lens is now waiting for the stars.#telescope #astrophotography Fat is beautiful https://t.co/GCYzoV1CjU" / Twitter](https://pbs.twimg.com/media/C99FYcfWsAUVvA0.jpg)