Pentax DA 12-24mm f/4 ED AL (IF) Lens for Pentax and Samsung Digital SLR's

by Pentax

• Metal PENTAX KAF Lens Mount
• Equivalent focal length to 18.5mm-37mm in the 35mm format with *ist DSLRs
• Extra-low Dispersion (ED) glass for superior sharpness and color correction
• Responsive Quick-Shift Focus System allows instant shift from AF to MF
• The image circle is designed to match the CCD used in PENTAX digital SLRs

Product Details

• Product Dimensions: 9 x 9 x 9 inches ; 15.2 ounces
• Shipping Weight: 1 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000B8AF9W
• California residents: Click here for Proposition 65 warning.
• Item model number: 21577
• Average Customer Review: 4.6 out of 5 stars  See all reviews (16 customer reviews)
• Date first available at Amazon.com: August 31, 2005

Product Description

Amazon.com

Boasting extra-low-dispersion (ED) glass elements and two aspherical lens elements, the Pentax DA 12-24mm f/4 wide-angle lens offers more true-to-life image reproduction than most comparable lenses. The lens--which is compatible with Pentax and Samsung digital SLR cameras--offers an image circle that's designed to perfectly match the 23.5 x 15.7mm size of the Pentax digital CCD. This helps optimize camera performance so that you can capture terrific shots of landscapes, family portraits, or sporting tableaus. The responsive Quick-Shift Focus system, meanwhile, makes it easy to instantly shift from autofocus to manual focus. And thanks to the aforementioned ED glass elements, the lens offers superior sharpness and color correction. Other features include a metal Pentax KAF lens mount, a lens hood that minimizes flare and ghost images, and a 1-foot close focusing distance.

Specifications

• Focal length: 12-24mm
• Maximum aperture: f/4.0
• Minimum aperture: f/22
• Lens construction: 13 elements in 11 groups
• Angle of view: 99 to 61 degrees
• Number of diaphragm blades: 8
• Diaphragm: Fully automatic
• Minimum focusing distance: 1 foot
• Maximum magnification: 0.12x
• Filter diameter: 77mm
• Hood: PH-RBI
• Mount: Pentax
• Case: S80-120 soft case
• Dimensions: 3.3 inches in diameter
• Weight: 15.2 ounces
• Warranty: 1 year

Product Description

Metal PENTAX KAF Lens Mount Equivalent focal length to 18.5mm-37mm in the 35mm format with *ist DSLRs Extra-low Dispersion (ED) glass for superior sharpness and color correction Responsive Quick-Shift Focus System allows instant shift from AF to MF The image circle is designed to match the CCD used in PENTAX digital SLRs Comes with a lens hood to minimize flare and ghost images

Most Helpful Customer Reviews

35 of 35 people found the following review helpful

4.0 out of 5 stars Vivid color, amazing linearity, sharp to corners - but delicate alignment September 1, 2007

By Rudy

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. At first glance, a 2X zoom doesn't sound impressive these days - until you realize that this parafocal zoom sweeps an incredible 100 to 60 degree viewing range, that's just perfect for cramped interiors, group pictures or landscapes. This zoom is a landmark of stellar engineering: combining extra-dispersion glass and aspheric lens elements into flagship "great glass".

But a finely-tuned optical engine performs optimally only if all cylinders fire in unison ... at daylight trial, I noted a hideous 'purple fringing' [chromatic aberration] of trees and power lines outlined against an overcast sky -- something was badly remiss. Rather than returning the lens, I packed it up for warranty service so as to alert the manufacturer to quality control slippage. Irreparable misalignment [probably from rough shipping/handling] was acknowledged; replacement with a brand-new lens was hassle-free as well as timely.

Should you detect distortion (run some test shots before starting a formal shoot!), fear not -- Pentax service was knowledgeable, courteous, and helpful. To their great credit, exchange was virtually painless, and the new replacement lens at last performs flawlessly. Although the initial unit turned out to be a glass lemon, Pentax made good (try that with a new car!); I have nothing but praise for the fair and decisive warranty follow-through.

Tip: the bulbous cyclops snout of the forward element is close to the surface, begging for scratches and smudges. Protecting the front end with a haze or UV filter in essence adds an unproven 14th glass element to a balanced optical design -- buy the high quality multi-coated filter (mounted in a thin WA ring) this star performer deserves to minimize glare, internal reflection and corner vignetting.

46 of 48 people found the following review helpful

5.0 out of 5 stars A must for the wide end January 9, 2007

By Lauren G

The main problem with the APS-C sensor is the fact that to get a very wide angle of view, you need a special lens. My old 20mm lens, which has served me for many, many, years, is just a moderate wide on the digital sensors.

With a few doubts, I sprang for this super-wide zoom.

WHAT A SURPRISE! This lens is AMAZING!

Low or no distortion (you can get away without correcting for distortion in Photoshop - quite a feat - unless you have a fanatical lunatic architectural client). CA hard to see. Very sharp, sharper wide open than any zoom has a right to be!!

Flare is so well controlled, I shot right into th sun and did NOT get the usual string of circles, just one ghost. How do they DO that???

The constant aperture is a blessing (I still refuse to buy a zoom with a variable aperture).

All modern lenses are polycarbonate. Supposedly, it's more dimensionally stable than metal under temperature extremes. Maybe so, but I still have some of the older K and M lenses and some Limited lenses. I guess I'm just old fashioned.

But with the APS-C sensor, you need a VERY wide lens. This is the one that will save your hide on any assignment where you need ultra-wide angle of view.

Penatx has always been known for their glass. With this lens, they continue to impress those who know that the glass is what counts!

9 of 9 people found the following review helpful

5.0 out of 5 stars A nice ultrawide June 20, 2008

By K. Gittins

This lens covers a handy range of focal lengths. At 24mm (equivalent to 35mm on a 35mm film camera) it replicates the popular moderate wide angle that is handy for car shows, architecture, landscapes and group shots.

Go down to 12mm, and you get a very wide view, great depth of field, and essentially no barrel distortion.

Although there is some overlap in the focal length of the Pentax 10-17mm lens, that one has the pronounced "fisheye" distortion (though not too much at 17mm), while the 12-24 maintains straight lines (it's "rectilinear") though if you are tilted up (or down), your subject will lean in (or out).

More expensive than some lenses but less than others, I say it is worth it. Its constant f4 maximum aperture is part of the cost (and weight).

It is a little bulky, not lightweight, and has a rather large lens hood, so you might have to rearrange your bag divider...