DA*?50-135?F2.8?ED(IF)?SDM is one of Pentax’s professional star heads. It has a very good reputation and is worth owning.
A telephoto zoom lens with rich grayscale levels and a strong three-dimensional effect?
On a background with smooth shading, it can achieve imaging of the subject being photographed in three dimensions. ?
There is little color bleeding even in details, and the imaging performance is clear. It is a star lens in the digital era. It has a large aperture of F2.8, is small and compact, and has strong operability. ?
Built-in ultrasonic motor (SDM mechanism)?
Built-in AF mechanism (SDM mechanism) driven by a compact ultrasonic motor. Equipped with a braking function, it is easy to control the speed and position, enabling smooth and high-quality AF work.
If installed on K10D, it will automatically switch to AF driven by the SDM mechanism (Note 1); If installed on a PENTAX digital SLR camera other than K10D, it will support AF driven by the motor inside the body. AF works (Note 2).
(Note 1) The firmware of the K10D on sale does not support ultrasonic motors. The corresponding firmware needs to be downloaded from our company and installed on the camera. ?
(Note 2) For the istD series and K100D, it is possible to automatically switch to in-camera motor-driven AF.
Features
The viewing angle is 35mm, which is equivalent to the focal length range of 76.5~207mm?
A telephoto zoom lens with a zoom ratio of about 2.7x, in addition to supporting In addition to landscapes and portraits, it also supports sports-type moment-to-moment photography. ?
Large aperture of F2.8?
The constant aperture of F2.8 throughout the entire process makes the picture brighter. Rich background blur expression and high-speed shutter can seize every shooting opportunity. Compact flexibility is also its unique feature. ?
ED (Extra-low Dispersion)?
Using 3 ED (Extra-low Dispersion) glass lenses to completely eliminate chromatic aberration. It features clear images with high resolution, beautiful tones without bleeding, and realistic imaging. ?
IF (Internal Focusing System)?
The overall length remains unchanged when focusing, enabling highly balanced operability. ?
Dust-proof and drip-proof structure?
Every part is sealed to prevent dust and drip, which is a structure that traditional lenses do not have. This makes it difficult for water droplets and dust to enter the interior of the lens. If combined with the K10D, which has a dust-proof and drip-proof body, it can even achieve superior weather resistance. ?
Quick switching focus system?
After AF achieves focus, if you directly turn the focus ring, it will immediately switch to manual focus. Easy to operate, switching operations are effortless. ?
SP Super Coating?
A special coating that is both hydrophobic and oil-repellent is used on the front of the first lens. Dirt is difficult to adhere to and falls off easily, effectively protecting the lens. ?
Anti-ghosting coating
Using a coating that can remove internal reflections in the lens and suppress ghosting. Even under harsh conditions such as backlighting, clear images with high contrast can be obtained.
Lens structure diagram
Technical parameters
Viewing angle [degree]? 31.5～11.9
Number of components [group*pieces]? 14 ?·?18
Minimum aperture [?F?]?F22
Minimum photographic distance [?m?]?1.0
Filter diameter [?mm ?]?67
Maximum diameter × length [?mm?]?76.5×136
Mass (weight) [g]?685
Light hood? PH-RBK67