This wide angle lens has two optional adaptors, both of which I have in my collection. One is an ultra-wide angle converter and the other is a fish-eye converter. The first increases the angle to 21mm and the second increases the angle to 16mm.
I want to say I have been a bit underwhelmed by this kit. That said I have gotten some interesting results (see samples below). The 2/28mm gets a 4.22 overall rating on Dyxum, with 4.68 for sharpness. But the lens gives too much distortion yielding a rating of 3.46 in this category.
It is easy enough to snap on the ultra wide angle or fish eye adaptors. These provide for some unique shots suitable for creative photography.
Here is Sony’s promotional blurb:
An excellent choice as a second lens to supplement a basic lens kit, featuring a bright F2.0 maximum aperture and outstanding overall optical performance.
Professional reviews:
Sample images: