Summary: Being primarily a landscape shooter, a wide angle lens is necessary. In APS-C with a 1.5 crop factor, the Pentax 12-24 gives an equivalent 18-36mm field of view. Although great landscapes can be done with telephoto lenses, dramatic framing with a wide angle can mreally make for a great composition. And this lens does not dissapoint! This 12-24 is sharp at 12mm wide open. Stop down a little, and 12mm through about 20mm is sharp across the frame.
Excerpt: You can feel the loss of light as its not f/2.8 indoors. Haven't had a chance to use it outdoors. With my Pentax K5, I have an accurate auto-focus issue with my Sigma 17-70mm which was't there with the K10D. Facing similar focus with this lens as well. Otherwise, great landscape lens.
Excerpt: great for landscapes, streetscapes, and anywhere you need wide angle. clear, crisp color..well made.....it's just that dang distoration in the corners at 12mm that keep it from being a 5 star lens.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Excerpt: Primarily I shoot wide angle in the portrait (vertical) position while backpacking and climbing. I purchased this lens with the Pentax K-7 to replace my aging Zeiss and 10 megapixel system. Pros: This lens performs admirably compared to the Zeiss. The narrow zoom range and excellent image quality really makes this lens comparable to several primes. Small details in the center and corners are excellent.
Excerpt: Needed an ultra wide lense and this fits the bill for me. Very sharp into corners, has exceeded all my expectations. Having said that I am but a beginner at this game.<br />Only negative is the size and weight. The hood is enormous and I have trouble fitting into my bag. But worth it given the extra width now available.
Excerpt: I'm using this lens on my K10D - The quality of the optics is great - but I was surprised to see very significant vignetting when set at 12 mm, by the supplied lens hood, even without using any filters. I was using shake reduction, and I did note the vignetting occurred only at the top of the frame - quite mysterious.
Vivid color, amazing linearity, sharp to corners - but delicate alignment
Rudy "pain-doc", Amazon
1 September 2007
Summary: Pop Photo (Apr-06) praised this lens as a "Wide Winner" for spectacular performance on bench testing: excellent image sharpness and contrast; imperceptible distortion ["best of breed"]; and barely notable vignetting at the short end. I can add breathtaking color, crisp contrast and ruler-straight linearity to that list.