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Pentax smc DA 300 mm f/4 ED[IF] SDM

Pentax smc DA 300 mm f/4 ED[IF] SDM lens
 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

One or more Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

No Internal Zoom

Internally zooming lenses don't change their size while focal length is changing.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

 

No drop-in filter support

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.

Pentax smc DA 300 mm f/4 ED[IF] SDM Specification

Available mount(s) Pentax K
Application(s)
Category(s)
Multiplier N/A
Stabilizer no
Focal length 300 mm (prime)
Lens construction 8 elements in 6 groups
Angle of view 35mm: N/A
digital: 5.4°
Number of blades 9
Maximum aperture f/4
Minimum aperture f/32
Minimum focusing distance 140 cm
Magnification 0.24×
Filter size 77 mm
Size ∅ 83 × 184 mm
Weight 1070 g
Notes
AF speed N/A
AF sound
Internal focusing yes
Internal zoom no
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter no
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle N/A
Low dispersion lens element yes
Hard case N/A
Soft case S120-210 (included)
Lens hood PH-RBK77 (included)
Tripod adapter included
Pentax smc DA 300 mm f/4 ED[IF] SDM Specification

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