List Price: $1,079.00
Sale Price: $799.99
Today's Bonus: 26% Off
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.
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