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Pentax smc DA 50mm f/1.8

Pentax smc DA 50mm f/1.8 lens

APS-C sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.


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.


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 50mm f/1.8 Specification

Available mount(s) Pentax K
Application(s) Portrait, Sports
Category(s) Standard prime
Multiplier 1.5×
Stabilizer no
Focal length 50 mm (prime)
Lens construction 6 elements in 5 groups
Angle of view 35mm: N/A
digital: 31.5°
Number of blades 7
Maximum aperture f/1.8
Minimum aperture f/22
Minimum focusing distance 45 cm
Magnification 0.15×
Filter size 52 mm
Size ∅ 63×38.5 mm
Weight 122 g
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 N/A
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element N/A
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Pentax smc DA 50mm f/1.8 Specification

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