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Pentax smc DA Star 300mm F4 ED SDM review
Designed to produce powerful telephoto images, the smc PENTAX-DA* 300mm F4
ED[IF] SDM is a uni-focal super-telephoto lens with a focal length
equivalent to 460mm in the 35mm format. It minimizes chromatic aberrations
by incorporating ED (Extra-low Dispersion) optical elements in its second
and fifth lens. It also offers a minimum focusing distance of 1.4 m
(4.6ft), which is the shortest in its product category. Featuring advanced
technologies, such as special optical glass elements and PENTAX-original
lens coatings, it is designed to assure exceptional optical performance and
deliver clear, high-contrast images, even at image-field edges. SDM
mechanism, assuring extra-smooth, super-quiet autofocus operation using a
supersonic motor installed in the lens (Conventional autofocus operation
using a camera-installed motor is also possible.) Dust-resistant,
weather-resistant construction with a set of seals to prevent intrusion of
dust and water into the lens Inner Focus mechanism for effective
compensation of various aberrations at all focusing distances SP (Super
Protect) coating applied to the front surface of the optics to block dust
and dirt Quick-Shift Focus system for instant switching to manual-focus
operation after the subject is captured in focus by the AF system.
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