When I look at the patent, I don't see an IS element.Given the size and new composite material outlined in this lens patent I would expect Canon to have it introduced as a 50mm 1.4 L IS much akin to the ef 85mm 1.4 L IS.
That said, whatever happened to that 600mm f4 DO BR L IS lens they had a prototype of? The dimensions looked super svelte when they showed it in 2015.
With IS the formula would be different, and maybe even longer.
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