Great Lens the improvement is incredible
love this prouduct, it doesn't get any better
I purchased this lens as an add-on to my Panasonic DMC-FZ50 that I use as a travel/family camera.
I wanted something that gave me extreme wide angle without an extreme price. This lens is great, but if you want the best results with this lens on a digital still camera you need to post process your images.
I have to remove chromatic aberrations from the images, apply sharpening to improve the corners/edges, and "sometimes" crop the images if the corner softness was too bad.
Overall, this is a good addition to a fixed lens camera like the FZ50, but I get much better results with a real fisheye lens on my Pentax DSLRs.