Superb walk around lens. I use it on a Pentax K1 and edge to edge sharpness at various focal lengths is good to excellent, although not quite in the class of prime lenses. Highly recommended, especially for travel photography.

I wanted a digital zoom lens for my new K-1, having only older FA limited lenses and not wanting to shell out almost the same amount as I did on the camera. It focuses very quiet and fast, it takes good pictures outdoors, as stated buy another review, get the DA F 24-70 f2.8 if you plan to do any...

I use this product on a Pentax k1

Haven't used it much, but looking forward to some great shots of race cars at night!

This lens is sharp and fast. It's very impressed. I use my Pentax K-1 with 28-105mm. This lens is made for the full frame K-1.I'm still enjoying this lens and have produced many excellent images with it already.

As others have said, this is a great walk-around lens to have on your camera. It's very easy to use, easy to carry and focuses quickly and quietly. When it comes to sharpness, however, the images it produces are a little soft; that's is the only issue keeping me from giving this 5 stars.

Using this with Pentax K-1. There is plenty of reviews around of this lense, check them. My personal opinion: This is the best all-around and walk-around zoom choice for K-1 at this price. It is sharp "enough" from open to f16. The IQ is very good, the lens focuses fast, accurately and silently.

Excellent build quality and image quality when used with the K1 full frame.

This lens has absolutely changed the quality of images I was getting with my K-3. Because the lens is made for the full frame K-1 it is heavy and large compared to many of the lenses I have specifically for the smaller sensor. The image and build quality far exceed the negative of the weight.

Every K-1 owner should consider this lens: light-weight, nice build quality with smooth zoom action, weather-sealed, sharp throughout the zoom range, and relatively inexpensive. Downsides include strong vignetting, and typical levels of distortion from a zoom with this much range.