Konica Minolta 20mm f/2.8 AF
(From Konica Minolta lens literature) This ultra-wideangle lens has a rear-focusing floating optical system that ensures quick, precise autofocusing and virtually eliminates close-focus aberrations. Its seven-blade aperture produces a circular opening to provide round, natural background highlights.
Konica Minolta 20mm f/2.8 AF User Reviews
9 out of 10 points and recommended by Seagr112 (2 reviews)Lightweight, SharpClunky AF
It's wide, it's small and it produces very good images. For the price on the used market, it is an excellent value. Minimum distortions and vignette. Recommended.reviewed December 31st, 2008
I sold the Sigma 20/1.8 and kept this one, primarily because of the size/weight difference, although it was a pretty decent performer too.