Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A nice ultrawide

This lens covers a handy range of focal lengths. At 24mm (equivalent to 35mm on a 35mm film camera) it replicates the popular moderate wide angle that is handy for car shows, architecture, landscapes and group shots.Go down to 12mm, and you get a very wide view, great depth of field, and essentially no barrel distortion.Although there is some overlap in the focal length of the Pentax 10-17mm lens, that one has the pronounced "fisheye" distortion (though not too much at 17mm), while the 12-24 maintains straight lines (it's "rectilinear") though if you are tilted up (or down), your subject will lean in (or out).More expensive than some lenses but less than others, I say it is worth it. Its constant f4 maximum aperture is part of the cost (and weight).It is a little bulky, not lightweight, and has a rather large lens hood, so you might have to rearrange your bag divider...