Canon RF 600mm and 800mm f/11: are these fixed-aperture telephotos worth it? – TechRadar

Super telephoto primes have always been specialty lenses. Unless you were regularly shooting sports or wildlife, it was virtually impossible to justify the cost. Of course, a smaller sensor size makes it easier to get to the super telephoto focal lengths essentially anything longer than 300mm but even these lenses can still be quite expensive, especially the faster primes.
Take for example Sonys 400mm f/2.8 GM OSS for the FE mount this excellent lens costs just shy of $12,000 /  £10,500 / AU$19,500…

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