Best lenses for the 24-MPix Pentax K-3: Recommended primes and zoomsBy Kevin Carter - Monday January 06 2014 Lens Recommendations
Sigma’s high-grade models continue to perform well with the constant aperture ultrasonic focusing 17-50mm f2.8 EX DC HSM sitting in the top slot out of those tested, and that includes Pentax’s DA* 16-50mm f2.8 and the more modest DA 16-45mm f4, albeit those models coming in second and third place respectively. The Sigma has the highest measured peak sharpness and it’s the best corrected of the 14 models in our database tested on the K-3.
If the 16-45mm and 16-50mm models aren’t quite wide enough, as an 18-36mm equivalent, the Pentax 12-24mm f4 ED AL (IF) is in joint third place with a DxOMark score of 15 and a respectable 10P-Mpix sharpness score. With a 13.8x zoom ratio, the $499 27-375mm equivalent 18-250mm performs well if it can still be found – it has recently been replaced by the 18-270mm f3.5-6.3, which although upgraded with an ultrasonic type AF motor also comes with a hefty 50% premium in price ($749) together with a slight hit in optical performance.
We’re working hard on expanding the range of Pentax lenses in our database, but we’re interested to know if there are certain models that you would like to see reviewed first. Please leave your recommendations in the comments section below.