Canon EF 11-24mm f/4 L USM

	Full frame 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. 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. 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. Supports drop-in filters 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.

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Canon EF 11-24mm f/4 L USM Specification

Canon EF 11-24mm f/4 L USM Specification
Available mount(s)	Canon EF
Application(s)	Landscape, Interiors, Architecture
Category(s)	Wide angle zoom
Multiplier	1×
Stabilizer	no
Focal length	11 - 24 mm (2.20× zoom)
Lens construction	16 elements in 11 groups
Angle of view	35mm: 126.1-84° digital: 101.6-58.8°
Number of blades	9
Maximum aperture	wide: f/4 tele: f/4
Minimum aperture	wide: f/22 tele: f/22
Minimum focusing distance	28 cm
Magnification	0.16×
Filter size	N/A
Size	∅ 108 × 132 mm
Weight	1180 g
Notes
AF speed	N/A
AF sound
Internal focusing	yes
Internal zoom	no
Fix front lens	yes
Mount type	metal
Weather sealed	yes
Drop in filter	yes
Ultrasonic AF	yes
Stepping motor AF	no
APS-C sized circle	no
Low dispersion lens element	yes
Hard case	N/A
Soft case	N/A
Lens hood	N/A
Tripod adapter	N/A