I got my 15mm f/8 last week (A friend bought it in US when he was there). Having used it out for a few days now; I felt I should write a few words and show some photos.
It is basically a lens-cap with a small lens in the middle (three elements in the construction). The aperture is fixed at f/8 and focus is manual. This is done by using a small lever at the bottom of the lens (much like the good old Olympus XA). There is three click-stops, one at the hyper-focal distance (everything from 4ft/1.6m to infinity in focus), one at infinity and one where there is a cover in front of the lens.
It vignettes quite a lot, and both the Panasonic G3 and Olympus E-P1 tends to underexpose quite a bit; but that could be caused by the sun and snow. But the sharpness in the center is not too bad.
Here are a few photos:
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