A great secondary lens, good quality for the money.
4 June 2012
Summary: I bought this particular lens to meet a need for wide angle coverage on a Nex-7 using a leica M mount. I was aware of the magenta color issues at the edges of the frame prior to the purchase and felt working these issues out via photoshop or darkroom programs would be justified because of the lens price. The lens is of a very high quality indeed.
Summary: extremely useful lens for both digital and film. For digital, decent wide angle for R-D1 and other crop digital body with nice color balance. For film, it's just perfect extreme wide lens for landscape, and snaps.
Summary: Very nice lens. Works best if stopped down a bit. Great construction and affordability. Since there are no other lenses available in this focal length, your choices are limited. Leica's own 21mm is phenomenal, but very pricey. Obviously, this is a special purpose lens, along with their 12mm, but it does have its uses.