The smc PENTAX DA Star 300mm F4 ED (IF) SDM is a high-performance telephoto lens.
The tightly sealed, weather-resistant and dust-resistant construction enhances durability for use in both rainy and dusty conditions, making the DA Star 300mm F4 ED (IF) SDM lens a perfect companion for the weather-resistant PENTAX DSLR bodies.
The PENTAX-original Quick-Shift Focus System allows instant switching from autofocus to manual focus operation.
The PENTAX-original SP (Super Protect) coating repels dust, water and grease to keep your lens clean and your image quality at its peak.
The SDM focus system incorporated in this lens results in a smoother, quieter autofocusing operation using a built-in supersonic motor.
The Extra-low Dispersion (ED) elements compensate for chromatic aberration.
The focal length is equivalent to 450mm in the 35mm format.
Developed specifically for PENTAX digital SLR cameras.
Lens Mount:    PENTAX KAF2
Lens Construction:    8 elements in 6 groups
Angle of View:    5.4 degrees
Aperture:    F4
Number of Diaphragm Blades:    9
Minimum Aperture:    F32
Minimum Focusing Distance:    55.2 inches (1.4m)
Filter Diameter:    77mm
Maximum Magnification:    0.24X
Dimensions:    3.3 x 7.2" (83 x 184mm)
Weight:    37.7 oz. (1,070g)
Case:    S120-210
Objective Cap:    O-LC77
Hood:    PH-RBK 77mm
Lens Aperture Ring:    N/A
Tripod Adapter:    Included, demountable w/coin
Diaphragm Control:    Fully Automatic
Focal Length:    300mm (equiv. 450mm)