|SMC||The super multi-layer coating is applied to the surface of lens elements. It boosts light transmission, ensures sharp and high contrast images, minimizes ghosting and flares. The smc coating is used in all Pentax K, 645 and 6x7 lenses and also in Asahi Takumar M42 lenses since 1971.|
|DA||Autofocus lens for Pentax APS-C digital SLR cameras. Has no aperture control ring and only supports electronic aperture control from the camera.|
|*||Professional lens with high quality optics and robust build. Meets the highest standards and provides excellent performance and flawless image quality unachievable with traditional optical technologies.|
|ED||The lens incorporates one or several low dispersion elements to minimize chromatic aberrations and ensure excellent sharpness and contrast even at maximum aperture.|
|AL||The lens incorporates one or several aspherical elements to minimize spherical aberration, astigmatism, coma and ensure excellent sharpness and contrast even at maximum aperture.|
|[IF]||The lens has internal focusing. Learn more|
|SDM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
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|Diagonal angle of view:||82.9°-31.6° (Pentax APS-C)
|Lens construction:||15 elements in 12 groups, including 3 ASPH, 2 ED|
|Closest focusing distance:||30 cm|
|Magnification ratio:||1:4.8 @ 50 mm at the closest focusing distance|
|Number of diaphragm blades:||9|
|Type of autofocus motor:||Ultrasonic (Pentax K)
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø84 x 98.5 mm|
|Materials:||High-quality plastic barrel, metallic mount|
|Weather sealing:||Dust-proof and water-resistant housing|
|Fluorine coating:||Front element|
|Filter size:||77 mm|
Design and Features
The lens is a result of cooperation between Pentax and Tokina companies and is known as Tokina AT-X Pro 165 AF SD 16-50mm F/2.8 (IF) DX in Canon EOS and Nikon F systems.
The lens barrel is of moderate weight, dust-proof and water-resistant, made of high-quality plastic. The lens mount is metallic. Both the zoom and focusing rings are wide, rubberized and deeply ribbed in order to provide good grip and prevent slippage of fingers. The lens has a distance scale.
The lens features AF/MF focus mode switch.
|AF||Autofocus mode with Quick-Shift Focus System.|
|MF||Manual focus mode.|
The lens uses front filters with standard size of 77 mm which are easy to find. However, filters of such size are more expensive and mainly used with professional lenses.
The filter thread does not rotate during focusing which allows convenient use of different types of filters (including but not limited to polarizing and gradient).
Dedicated petal bayonet lens hood (a part of the package) features a slide-out window which enables rotation of polarizing filter without removing the lens hood.
A fluorine coating has been applied to the outer surface of the front lens element to repel water or oil drops for easier cleaning of the lens surface.
The lens is equipped with ultrasonic motor, the autofocus is virtually silent and very fast. The lens features Quick-Shift Focus System: after autofocus is achieved, the focusing ring can be turned to adjust the focus manually. This feature eliminates the need for changing the focus mode to MF.
|Sensor size||23.5×15.7 mm|
|Distortion at 16 mm||-3.63 %|
|Distortion at 50 mm||+0.57 %|
|Vignetting at 16 mm F/2.8||-1.24 EV|
|Vignetting at 50 mm F/2.8||-0.88 EV|
|Pentax lenses: compendium|
Alternatives (AF, 14-56 mm)
|Sigma 17-50mm F/2.8 EX DC OS HSM||2010||⊗|
|Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) A16||2006||⊗|