Canon EF 24-105mm f/3.5-5.6 IS STM

	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. 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. 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.

Canon EF 24-105mm f/3.5-5.6 IS STM Specification

Canon EF 24-105mm f/3.5-5.6 IS STM Specification
Available mount(s)	Canon EF
Application(s)	Portrait, Closeup, Landscape, Interiors, Architecture
Category(s)	Standard zoom
Multiplier	1×
Stabilizer	N/A
Focal length	24 - 105 mm (4.40× zoom)
Lens construction	17 elements in 13 groups
Angle of view	35mm: 74-19.3° digital: 58.8-12.9°
Number of blades	7
Maximum aperture	wide: f/3.5 tele: f/5.6
Minimum aperture	wide: f/22 tele: f/32
Minimum focusing distance	40 cm
Magnification	0.3×
Filter size	77 mm
Size	∅ 83.4 × 104 mm
Weight	525 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	N/A
Ultrasonic AF	N/A
Stepping motor AF	yes
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

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