Pentax 150-450 mm F4.5-5.6 FA ED DC AW HD Objective

This super-telephoto zoom lens has been developed to cover focal lengths from 150mm to 450mm — a focal-length range most demanded by high-end PENTAX-camera users

It features the PENTAX-original, high-grade HD Coating to produce extra-sharp, high-contrast images even under demanding lighting conditions such as in backlight. It also incorporates three ED (Extra-low Dispersion) Glass elements and an Anomalous Dispersion Glass element to effectively compensate chromatic aberration. Its dustproof, weather-resistant body also makes it extremely dependable and durable in demanding outdoor conditions.


Features:

Super-telephoto coverage with three-times zoom ratio:
This zoom lens covers a super-telephoto range from 150mm to 450mm. It is designed to be compact and light enough to handhold during long-range shooting of such subjects as wildlife, aircraft and sports.

Outstanding image description:
Thanks to its state-of-the-art optics featuring three ED (Extra-low Dispersion) Glass elements and one Anomalous Dispersion Glass element, this zoom lens effectively minimizes spherical and chromatic aberrations, while producing crisp, high-quality images free of color bleeding.

HD Coating to optimize image rendition:
This lens is treated with the high-grade, multi-layer HD Coating. Compared with conventional multi-layer coatings, this PENTAX-original coating assures higher light transmittance and less reflection to deliver bright, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as backlight.

Dustproof, weather-resistant construction:
Developed as an AW (All Weather) model, this zoom lens features a dependable dustproof, weather-resistant construction with 21 special seals to prevent the intrusion of water and dust particles into the lens interior. By pairing it with a PENTAX weather-resistant digital SLR camera body, it assures a durable, reliable digital imaging system that performs superbly in demanding shooting settings — even in rain or mist, or at locations prone to water splashes or spray.

Newly installed three-position switch for Quick-Shift Focus System:
In order to improve its operability, a three-position switch is newly installed on this lens, allowing instant switching among QFS/A, QFS/M and MF modes. QFS/A is an autofocus-priority mode, which allows the user to switch to manual-focusing operation only when autofocus operation is completed. QFS/M is a manual-focus-priority mode, which enables the user to switch to manual focusing at any time — even when the AF system is in operation. MF mode allows the user to instantly switch to manual focusing with a simple twist of the focus ring on the lens. With a choice of three distinctive modes, the user is assured of speedier, more accurate focusing operation for a given subject or application.

Four AF buttons installed on the lens barrel:
In order to provide more stable AF operation and better hold of the lens regardless of the camera’s orientation — horizontal or vertical — this lens provides four AF buttons on its barrel — one at every 90 degrees.* The user can assign preferred settings to these AF buttons, including: a Focus Preset mode to preprogram the focus position and instantly shift the focus to that position; and an AF Cancel mode to intentionally fix the focus at a desired point during Continuous AF operation.
* Corresponding models are K-1 Mark II, K-1, KP, K-3II, K-3, K-70, K-S2, K-S1. For K-3 and K-S1, Firmware upgrade is required. Link to the latest firmware

Other features:
- Smooth, quiet AF operation using a lens-installed AF driving motor
- Round-shaped diaphragm to produce a natural, beautiful bokeh (defocus) effect, while minimizing the streaking effect of point light sources
- Focus range limiter to minimize AF operation time by fixing the focus range to one of three sub-ranges
- SP (Super Protect) coating to keep the front surface free of dust and stains
- Zoom lock lever to prevent the lens barrel from free-falling
- Detachable tripod mounting with a newly designed anti-falling mechanism


Specifications:

- Type: Super Telephoto

Focal length (Equivalent in 35mm format)
- 150-450mm
- Equivalent to 230-690mm in 35mm format (when attached to PENTAX APS-C size DSLR cameras)

- Maximum Aperture: F4.5-5.6
- Minimum Aperture: F22-27

Angle of View:
- 10.7-3.6°(when attached to PENTAX digital SLR cameras)
- 16.5-5.5°(when attached to PENTAX 35mm SLR cameras)

- Lens construction: 18 elements / 14 groups
- No. of diaphragm blades: 9
- Rounded aperture（150mm: F4.5-8　450mm: F5.6-8）
- Closest focusing distance: 2m
- Maximum reproduction ratio: 0.22x
- Filter size: 86mm
- Diameter x length: Approx.95mm x 241.5mm (3.7 in. x 9.5 in.)

Weight:
- Approx.2000g /70.5 oz (with hood Approx.2130g /75.1 oz)
- (with hood and tripod mount Approx.2325g/82.0 oz)

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