I did my research before buying. I purchased the ...
Paul Myers, Amazon
23 February 2015
Summary: I did my research before buying. I purchased the 16mm lens to get wider shots and added this converter for even WIDER shots. When using the flash it can create a shadow so I just learned to shoot without a flash to eliminate the shadow caused by the light deflector on the built onto the lens. I am a Realtor and was looking for a camera to capture a room with distortion or stretching. This one does it! Very little distortion compared to other wide angle lenses.
Go ahead and spend more - you're unlikely to get significantly better images
Medical Marketing Maven, Amazon
7 February 2015
Summary: I've looked closely at the images I get with this with the 16mm on my NEX-6 and those shot with the very expensive 10-18mm Sony wide angle, and the difference is immaterial to me. You need to keep people out of the very corners of the image, because the distortion there is considerable. But it is with the 11-16mm Tokina on my Nikon D7000 - so I think it's probably a characteristic of many super-wide optics.
Excerpt: I was excited to try out my new conversion lens with the Sony lens at the Phoenix Super Bowl event center. The lens seems to be more susceptible to lens flair than other wide angles I've used (namely a Leica/Lumix)and there is distortion in the corners and even the edges, particular with groups of people. I'm not sure if I would have purchased the conversion lens if I had known about the flair and distortion.
Excerpt: I have this adaptor attached to my Sony 20mm f/2.8 Alpha E-mount Lens. Color and detail are excellent with no visible distortion. There is a significant increase in the wide angle. It attached to the prime lens easily with a locking button to keep it attached. Excellent for indoor work and landscape photography.
Excerpt: I am a realtor and when I list a property my job is to take great wide angle pictures for my seller and my 16mm lens does not do an adequate job. This conversion lens with my 16mm will do the job correctly by including more space in the frame and then making the interior appear larger and more content. The large glass looks great and very easy to screw on to my 16mm. I am yet to take lanscape pictures with this conversion.
Excerpt: I've had this lens and the fisheye version for at least three years and have used it on my older NEX cameras and now on my new Sony a6000. Superb and no need to pay nearly a grand for prime or zoom wides from Sony or Zeiss. Can't tell the difference under most conditions. At around $ each for the wide and fisheye these are requisite companions to the 16mm prime lens.
Pros: Flexible Accessory, Lightweight, Reliable
Cons: Slightly Soft, Slightly Soft In Corners, Some Edge Distortion