|HD||The HD 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 HD coating reduces reflections 50% more efficiently in comparison with traditional smc coating throughout the visible spectrum and has exceptional hardness, which ensures its increased durability.|
|D-FA||Full frame autofocus lens for Pentax digital SLR cameras. Has no aperture control ring and only supports electronic aperture control from the camera.|
|ED||The lens incorporates low dispersion elements to minimize chromatic aberrations and ensure excellent sharpness and contrast even at maximum aperture.|
|AW||Dust-proof and water resistant lens.|
|DC||The lens is equipped with micromotor to provide moderately fast and quiet autofocus.|
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|Maximum format:||35mm full frame|
|Diagonal angle of view:||16.4°-5.5° (35mm full frame)|
|10.8°-3.6° (Pentax APS-C)|
|Lens construction:||18 elements in 14 groups, including:|
|Number of blades:||9|
|Closest focusing distance:||200 cm|
|Magnification ratio:||1:4.5 @ 450 mm at the closest focusing distance|
|Type of autofocus motor:||Micromotor (Pentax K)|
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø95 x 241.5 mm|
|Materials:||High-quality plastic barrel|
|Weather sealing:||Dust-proof and water-resistant barrel|
|Fluorine coating:||Front element|
|Filter size:||86 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.
The lens features a zoom lock lever to keep the zoom ring fixed at the shortest focal length of 150 mm. This function is convenient for carrying a camera with the lens on a strap because it prevents the lens from extending.
The lens features QFS/A - QFS/M - MF focus mode switch.
|QFS/A||Autofocus mode which allows the user to switch to manual-focusing operation only when autofocus operation is completed.|
|QFS/M||Autofocus mode which enables the user to switch to manual focusing at any time - even when the autofocus system is in operation.|
|MF||Manual focus mode.|
The lens features AF - PRESET MODE - AF-CANCEL switch which allows to select the function assigned to the focus function button located on the lens barrel.
|AF||Autofocus using the focus function button. The shutter button only releases the shutter in this mode. To lock focus or suspend autofocus, release the focus function button. Useful whenever any unwanted obstacle comes closer to the camera than the moving subject you are tracking. This function operates only in autofocus mode.|
|PRESET MODE||Focus on preset focusing distance even while you are shooting a different subject. This function operates in any focusing mode. To preset the focusing distance, focus the distance you want to preset and press the PRESET button. To focus on preset distance, set the switch to PRESET MODE, keep the focus function button pressed and then take the photograph. The previous focus is restored when the focus function button is released.|
|AF-CANCEL||Temporary lock autofocus. Useful whenever any unwanted obstacle comes closer to the camera than the moving subject you are tracking. If the shutter button is still pressed halfway when the focus function button is released, autofocusing will continue as before. This function operates only in autofocus mode.|
The lens features focusing distance range limiter which allows to choose between the following focusing distance ranges:
|FULL||Full range of focusing distances.|
|2 m - 6 m||Range of focusing distances suitable for shooting nearby subjects.|
|6 m - ∞||Range of focusing distances suitable for shooting distant subjects.|
By setting the suitable focusing distance range, the actual autofocusing time can be shorter.
The lens uses front filters with standard size of 86 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 micromotor, the autofocus is low noisy and 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.
2) On a tripod
|User Manual. English, Adobe PDF, 783 KB|
|Pentax lenses: compendium|
Alternatives (AF, 132-504 mm)
|Sigma 135-400mm F/4.5-5.6 APO DG||2005||⊗|
|Sigma 150-500mm F/5-6.3 APO DG OS HSM||2008||⊗|