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Pentax smc HD DA 20-40mm f/2.8-4 DC WR Limited

Pentax smc HD DA 20-40mm f/2.8-4 DC WR Limited 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 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.

 

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.

 

Weather Sealed

Weather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body.

Pentax smc HD DA 20-40mm f/2.8-4 DC WR Limited Specification

Available mount(s) Pentax K
Application(s) Landscape, Interiors, Architecture
Category(s) Wide angle zoom
Multiplier 1.5×
Stabilizer no
Focal length 20 - 40 mm (2× zoom)
Lens construction 9 elements in 8 groups
Angle of view 35mm: N/A
digital: 70-39°
Number of blades 9
Maximum aperture wide: f/2.8 tele: f/4
Minimum aperture wide: f/22 tele: f/32
Minimum focusing distance 28 cm
Magnification 0.2×
Filter size 55 mm
Size ∅ 71 × 68.5 mm
Weight 283 g
Notes
AF speed N/A
AF sound
Internal focusing N/A
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed yes
Drop in filter N/A
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element yes
Hard case N/A
Soft case P70-150 (not included)
Lens hood MH-RA55 (not included)
Tripod adapter N/A
Pentax smc HD DA 20-40mm f/2.8-4 DC WR Limited Specification

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