Buyer of conversion lens for 16mm Sony SEL I was very excited about the optical performance. After unpacking and very easy mounting of the conversion lens, I was positively surprised by the optical quality of the image results, especially in the center after the first attempt. After several recording series, however, presented a weaken, especially at full aperture. The close-up lens can be used with acceptable results only from aperture 8. This may also be the Sony 16mm lens that actually from Aperture 5.6 features only sharp over the entire image. This applies to the conversion lens until diaphragm 8 and even the outermost regions are not really sharp. More Able ends does not help either. This is a fisheye maybe not necessary? Those looking for an inexpensive alternative to fisheye lenses and no high demands on the edge sharpness is right here. For landscape photography the close-up lens can be used only from aperture 8, for Archtikturaufnahmen probably not useful.
