Bought this lens on eBay. First of all it is a mirror lens and does not contain any electronics. That means it is fixed aperture and you have to manually focus the Lens. Certain cameras such as the Sony A7 and A6xxx handle manual lenses with ease where as other cameras as such as Nikon require a...

I purchased this lens for bird photography, and I'm very pleased with it. It's compact, well-built, and fun to use. Once you've found focus the images are sharp across the field. I recommend that your camera have focus peaking to get the most out of this lens.