Rokinon 300mm f/6.3

A compact 300mm mirror lens that is available with mounts for most Compact System Cameras - and also produced for DSLR cameras.

The Rokinon 300mm f6.3 is a super-telephoto at an affordable price, and if you like doughnuts, then you'll love the bokeh.

I love seeing weird and quirky lenses and this one from Samyang certainly ticks those boxes. Is it any good though? The Samyang 300mm f/6.3 ED UMC CS is a mirror lens for APS-C mirrorless Canon or Sony cameras. I've never used one personally, though many mirror lenses do exist and their correct name is "catadioptric" lenses. I'm going to just directly quote a Wikipedia page for a summary: A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics).

Samyang have launched a new 300mm reflex or mirror lens with a fixed f/6.3 aperture. With a previous version of the lens only available for mirrorless cameras, the new version is designed for Digital SLRs featuring an APS-C sensor and comes in Canon, Nikon, Sony & Four Thirds lens mounts.   

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