Sigma 17-50mm F2.8 EX DC HSM for K-mount. It's a large-aperture, bright lens, and I think the resolution is better than the original, but I don't really like the colors, so I'm putting it up for sale hoping someone else will use it. I've had a filter on the front element since I took it out of the box after purchase, right up until just before taking the photos for this listing, so it should be clean. The connection side also looks clean. I've been careful to keep it dry, and although it's a layman's inspection, there doesn't seem to be any mold or the like. There are no problems with the operation, but the rubber parts (the parts you operate by hand when taking pictures), which are a weak point of Sigma lenses, are starting to turn white. Also, there are scratches on the underside of the hood, and there are small scratches overall. The operation is smooth. Please check the condition in the photos. Also, please refrain from purchasing if you are sensitive to these issues. The items for sale are the hood, lens, front and rear caps, and soft case. Thank you for your consideration.