Great lens, but wish the images were a little more sharp.
Heath A. Wright, Amazon
11 August 2013
Summary: This is a fantastic lens, however as others have stated photos are not as sharp as they shod be at lower f-stops. At f2.8, unless you are focused to infinity, the in-focus image is not tack sharp even with a tripod. The lens does create a nice bokeh however, and for landscape shots it is nice to have a fast prime lens to handle low-light conditions. Lens performs best with an aperture starting at f4.0 for shots that have closer subjects.
Summary: A great wide lens, it is unique if you are looking at a prime with AF. And this was a deal breaker for me. What does this review add to the other 8 reviews: - how does the lens keep its value over time (has not been mentioned in any of the previous reviews) - list of available alternatives - no one has mentioned the drawbacks of small form-factor - "dust magnet" behavior of the inner lining of the hood(this was the biggest issue for me (other than the fact that 15mm...
Very good ultra-wide angle lens, at least when stopped down
Joseph L. Kashi, Amazon
15 December 2011
Summary: As expected, this Pentax Limited lens is extremely well-constructed and works very smoothly. It's a pleasure to use it. Optically, the edges are rather soft until stopped down to f8, at which point it's quite sharp. Contrast is excellent at all apertures and definitely enhances image quality. CA are fairly low and easily corrected. At f 8, sharpness and image quality are high across the entire field. Output from this lens sharpens up considerably in Lightroom.
Summary: I really enjoy using this lens for landscape photography. It's not super sharp wide open, but stepped down a bit becomes very nice. Good solid build quality. I find myself using this lens more and more. The K20D I have has some problems locking focus at times, even in bright light, but I mostly shoot in manual mode set to infinity and shoot away, and unless something is very close, it'll be in focus.
Summary: I've gone sort of nuts buying Pentax lenses for my k5 and kx. I have the 10-17 Fisheye, 15mm Limited, 21mm Limited, 35 mm Macro Limited, 40 mm Limited, 70 mm Limited, 200mm DA*, 50mm Takumar m42 and just bought the 50mm f1.2 SMCA. I take a lot of events/street, flowers and nature shots. The 15mm takes amazing outdoor landscape shots. There is a bit of edge distortion and lack of sharpness at the edges. And a bit of minor vignetting.