There a lot of interest in the new Pentax 17 -70 DA SDM lens. Because of the photo posted below we have had many new people visit this Blog. We are currently building a new interactive web site with articles from our customers as well as our own articles, and one of the first articles will be about this lens because of this interest. In the mean time here are two photos taken at 17 mm and 70 mm, F4. Doing a test like this is not easy and this is only a start. I used an old copy stand and tried to make it level. The distance from the back of the camera is 15 in. or 39 cm. In reviewing these photos I see that the target is not set quite square. This test is meant to give you a indication of distortion and not sharpness. Bill Wilby