Amazon.com : Rokinon 300M-E-BK 300mm F6.3 Mirror Lens for Sony NEX Mirrorless Interchangeable Lens Cameras - E-Mount : Camera Lenses : Camera & Photo
Rokinon 300mm f6.3 is a very specific niche product with manual focus, fixed aperture and focal length. But for $242 and being extremely compact...
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