This lens when fitted to a smaller micro four thirds camera gives a truly pocketable camera, something the manufacturers have been trying to achieve for some time. Image quality is comparable to a better point-and-shoot compact camera.
This lens is flat enough to not protrude much further forward than the hand grip of the camera it is fitted to. When fitted to a small micro four thirds camera, such as one of the Olympus PEN series or Panasonic GF series, that gives a camera/lens combination with rectangular form that will fit comfortably into a large coat pocket.
The lens is fitted with a simple lever focus control, offering three positions in addition to one that closes a protective cover over the lens: close (0.3 metres), distant and infinity. There's a slight stop at each position, but with not much separation between the distant and infinity settings, and it can be difficult to tell which position has been set by touch alone, as the distant position is not very firm. There is plenty of distance between the close and distant settings, allowing for manually focussing between these two settings.
This is a simple lens, so don't expect top optical quality. There's quite a bit of chromatic aberration and noticeable vignetting. The chromatic aberration gives some loss of resolution but no worse than would the loss of resolution from noise in a point-and-shoot compact camera. My overall impression was that images are of slightly better quality than those produced using a Holga 'toy' lens.
I bought this lens as a means by which I could make my Panasonic GF3 into a take-everywhere camera that I can carry in my coat pocket, allowing me to finally abandon my last compact camera. It manages that, but not with the step-up in image quality I'd hoped for. I'd not expected it to produce pin-sharp, crystal-clear images but, at almost £70, I had expected slightly better optical quality than this has.