I don't have one myself although I've seen plenty of samples and good reviews. The lens seems fairly sharp and your FOV will resemble 24mm on dSLR. As a fisheye lens, there is a fair amount of distortion so you'll find that your trees and other vertical subjects bent as they near the edge of the frame.
If you are planning to get one from ebay, people recommend buying from the user "
zenitar"
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Pete - K200D
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You know you got a pretty serious case of LBA when you end up buying the same lens twice...