|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.|
|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:||79.5°-22.8° (Pentax APS-C)
|Lens construction:||17 elements in 12 groups, including 2 ASPH|
|Closest focusing distance:||28 cm|
|Magnification ratio:||1:3 @ 70 mm at the closest focusing distance|
|Number of diaphragm blades:||7|
|Type of autofocus motor:||Ultrasonic (Pentax K)
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø75 x 93.5 mm|
|Materials:||High-quality plastic barrel, metallic mount|
|Fluorine coating:||Front element|
|Filter size:||67 mm|
Design and Features
The lens barrel is of moderate weight, made of high-quality plastic. The lens mount is metallic. The zoom ring is wide, rubberized and deeply ribbed in order to provide good grip and prevent slippage of fingers. The lens has a distance scale, the focusing ring is convenient but has a very small angle of rotation which does not allow to perform precise manual focusing.
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.
The focusing ring rotates during autofocus which looks pretty anachronistic by today's standards. It is strongly recommended not to touch the ring or manually stop its movement because it might result in damage to the lens and/or camera.
|Camera||Pentax K10D||Pentax K20D|
|Sensor size||23.5×15.7 mm||23.4×15.6 mm|
|Distortion at 17 mm||-3.11 %||-3.82 %|
|Distortion at 70 mm||+0.892 %||+1.09 %|
|Vignetting at 17 mm F/4.0||-1.08 EV||-1 EV|
|Vignetting at 70 mm F/4.0||-0.74 EV||-0.8 EV|
|Pentax lenses: compendium|