|
 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
|
