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The SMC PENTAX DA 17-70mm f/4 AL [IF] SDM lens is designed for exclusive use with PENTAX digital SLR cameras. This standard lens with extra zoom offers outstanding, well-balanced handling, and covers the most frequently used focal lengths between wide-angle and telephoto making it ideal for a variety of shots including scenery, snapshot and portraiture.
This lens features a 4.1X zoom ratio covering wide-angle to moderate-telephoto ranges, andcovers a focal-length range from 26mm wide angle to 107mm telephoto in the 35mm format. When mounted on a compatible* DSLR camera body, the PENTAX-original SDM system driven by a built-in supersonic motor, offers exceptionally smooth, quiet autofocus.
* This lens is compatible with the K20D, K200D, K100D Super and K10D (with Ver. 1.30 or later firmware installed) and later PENTAX DSLR camera bodies. When mounted on other camera bodies, the focus mode is automatically switched to manual.
Developed specifically for PENTAX digital SLRs,** this 17-70mm lens also features PENTAX SP (Super Protect) coating that protects the exposed lens elements and repels dust, water and grease. It also features a Quick-shift Focus System that allows instant switching from auto to manual focus with a turn of the focus ring.
**SDM-only focusing lens may be used with non-SDM PENTAX DSLR bodies in manual focus
Other important features of this lens include:
Exceptional Image Clarity
Incorporating two hybrid aspherical (AL) optical elements, this zoom lens assures exceptional image quality while effectively compensating for various aberrations.
Maximum Aperture of f/4 Over Entire Zoom Range
With a maximum aperture of f/4 over the entire zoom range, the lens allows photographers to use higher shutter speeds to minimize camera shake (especially in telephoto applications) or reduce the depth of field to intentionally throw the background out of focus.
Close Minimum Focusing Distance
This lens offers a minimum focusing distance of 11 inches (0.28 meters) over the entire zoom range, and an Inner-Focus (IF) optical design that eliminates lens extension and retraction during focusing operation.
Digital SLR Optical Design
From lens coating and curvature to the positioning of optical elements, the lens optics are meticulously designed to optimize the lens's digital imaging characteristics. The image circle is perfectly proportioned to a PENTAX camera's image-sensor size.
A good all around lense, not real fast for indoors but out side it just shines and it is well built.
For the landscape (near to infinity) with lots of DOF and a slight rotation of the lens will find you in portrait place...VOILA!!
I use this lens for most of my photo work. If I could only have one lens this would be it and I'd still be happy. It focuses close, great color and very sharp. I wish it was weather proof and yes I have used it the rain.
I just started to use this lens on a new camera but feel it will be in my standard setup from now on. From the start this lens is impressive for its smooth quiet operation and extra fast focus. The lens hood is a little fussy to attach but stays put and doesn't interfere with the view.
This is my do everything lens, my work horse. Don't let people tell you that you need f2.8 you don't f4 is fast enough, and range makes it more useable. This lens makes beautiful flower pictures and portraits. It's great for weddings indoor and outdoor. The landscape pictures will just take your breath away.JB