There has been a lot of talk about Canon and catadioptric lenses (mirror) since a patent surfaced with new lens designs likely for the RF mount. It has been rumored for quite some time that Canon would be bringing an RF 1200mm f/8 lens for the EOS R system, which could actually be a mirror lens.
Canon does have a history with mirror lenses, including the behemoth Canon 5200mm f/14 along with an 800mm f/3.8 and a 2000mm f/11. A Canon Rumors reader sent me a brochure for these three lenses and I found it to be a fun read.
These lenses were developed in the mid-1960s and can still fetch a king's ransom on the used market. The 5200mm f/14 sold for about $50,000 a few years ago on ebay.
Check out the official Canon brochure:
Thanks a ton for the scans, Phil.
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Bring on the h8ers...
I suggest Micro four thirds.
PS: where are thou, sony ?