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Pentax smc DA 12-24mm f/4.0 ED AL (IF)

	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. 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. Not 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. 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.
The smc-DA series of lenses are particularly developed and designed for use with PENTAX digital cameras. They are designed to fulfil the high digital image technology standards of PENTAX digital SLR cameras and are intended exclusively for use with these cameras. Extreme focal lengths are the domain of SLR photography. With the 12 - 24mm zoom lens PENTAX has succeeded in mastering a difficult challenge and can now offer wide angle photography on the highest digital level. With the 35mm equivalent of an 18 - 36mm lens, breath taking photographs are possible even if the spatial surroundings are limited.

The smc-DA series of lenses are particularly developed and designed for use with PENTAX digital cameras. They are designed to fulfil the high digital image technology standards of PENTAX digital SLR cameras and are intended exclusively for use with these cameras. Extreme focal lengths are the domain of SLR photography. With the 12 - 24mm zoom lens PENTAX has succeeded in mastering a difficult challenge and can now offer wide angle photography on the highest digital level. With the 35mm equivalent of an 18 - 36mm lens, breath taking photographs are possible even if the spatial surroundings are limited.

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Pentax smc DA 12-24mm f/4.0 ED AL (IF) Specification

Pentax smc DA 12-24mm f/4.0 ED AL (IF) Specification
Available mount(s)	Pentax K
Application(s)	Landscape, Interiors, Architecture
Category(s)	Wide angle zoom
Multiplier	1.5×
Stabilizer	no
Focal length	12 - 24 mm (2× zoom)
Lens construction	13 elements in 11 groups
Angle of view	35mm: N/A digital: 99-61°
Number of blades	8
Maximum aperture	wide: f/4 tele: f/4
Minimum aperture	wide: f/22 tele: f/22
Minimum focusing distance	30 cm
Magnification	0.12×
Filter size	77 mm
Size	∅ 84 × 87.5 mm
Weight	430 g
Notes	Aperture control: Automatic, Metering system: TTL open-aperture metering
AF speed	N/A
AF sound
Internal focusing	yes
Internal zoom	no
Fix front lens	yes
Mount type	metal
Weather sealed	no
Drop in filter	no
Ultrasonic AF	no
Stepping motor AF	no
APS-C sized circle	yes
Low dispersion lens element	yes
Hard case	N/A
Soft case	S100-120 (not included)
Lens hood	PH-RBI 77MM (included)
Tripod adapter	N/A