HD PENTAX-D FA 70-200mm F2.8ED DC AW
Thanks to its large-aperture design, it provides a large maximum aperture of F2.8 at all focal lengths from 70mm to 200mmCoupled with other PENTAX-original lens-coating technologies — such as the newly developed Aero Bright Coating II assuring exceptionally low reflectance, and the high-grade HD Coating — it produces extra-sharp, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as in backlight.
...
In addition to four Anomalous Dispersion Glass elements and two ED (Extra-low Dispersion) Glass elements, its optics includes a pair of new Super ED glass elements to effectively compensate chromatic aberration over the entire zoom range and deliver crisp, high-resolution images with edge-to-edge sharpness.
Product specifications
HD PENTAX-D FA 70-200mm F2.8ED DC AW
21330 Black, 23330 Silver
Type
Telephoto Zoom
Focal length (Equivalent to 35mm format)
70-200mm(107-307mm)
Maximum Aperture
F2.8
Minimum Aperture
F22
Angle of View
34.5-12.5°(when attached to PENTAX 35mm full-frame SLR cameras)
23-8.1°(when attached to PENTAX APS-C size DSLR cameras)
Lens construction
19 elements / 16 groups
No. of diaphragm blades
9
Rounded aperture（F2.8-5.6）
Closest focusing distance
1.2m (3.9 ft.)
Maximum reproduction ratio
0.13x
Filter size
77mm
Diameter x length
Approx.91.5mm x 203mm (3.6 in. x 8 in.)
Weight
Approx.1755g /61.9 oz. (with hood Approx.1835g /64.7 oz.)
(with hood and tripod mount Approx.2030g/71.6 oz.)