|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 low dispersion elements to minimize chromatic aberrations 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|
|Diagonal angle of view:||26.5°-6.5° (Pentax APS-C)
|Lens construction:||15 elements in 13 groups, including:|
|Number of blades:||9|
|Closest focusing distance:||110 cm|
|Type of autofocus motor:||Supersonic Drive Motor|
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø82 x 167.5 mm|
|Materials:||High-quality plastic barrel|
|Weather sealing:||Dust-proof and water-resistant barrel|
|Fluorine coating:||Front element|
|Filter size:||67 mm|
Design and Features
The lens barrel is large, heavy, 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 finger slipping. 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 67 mm which are easy to find. They are also inexpensive.
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 60 mm:||-0.85 %|
|Distortion at 250 mm:||+0.48 %|
|Vignetting at 60 mm F/4.0:||-0.13 EV|
|Vignetting at 250 mm F/4.0:||-0.7 EV|