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Background and Identification
The Canon 100-400mm F4.5-5.6 IS Version I lens is an EF-mount telephoto zoom lens produced by Canon, Inc. Canon Inc. is a Japanese corporation specializing in optical, imaging, and industrial products such as lenses, cameras, medical equipment, scanners, printers, and semiconductor manufacturing equipment. The Version I lens was first introduced in September 1998 and an updated version (Version II) was released in November 2014. The Canon EF 100-400mm lens was sold as a high-performance telephoto lens designed for sports and wildlife photography.
For the Canon 100-400mm F4.5-5.6 IS Version I lens, the EF means “electronic focus,” meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. Its telescoping design means that the lens takes in air when zoomed in and out. The lens does not have anything to prevent this movement of air, so airborne dust is often sucked into the lens, which can cause problems.
The Canon 100-400mm F4.5-5.6 IS Version I lens is compatible with the Canon Extender EF teleconverters. The autofocus works on the 1.4x Extender and with cameras that can autofocus at f/8.
The Canon 100-400mm F4.5-5.6 IS Version I lens has a mostly cream-colored body with black accents. The lens’s name is printed above the lens cover on the main body of the device.
Focal Length: 100 to 400mm
Maximum Aperture: f/4.5 to 5.6
Minimum Aperture: f/32 to 38
Lens Mount: Canon EF
Format Compatibility: Full-Frame
Angle of View: 24° to 6° 10'
Minimum Focus Distance: 3.22' / 98 cm
Maximum Magnification: 0.31x
Optical Design: 21 Elements in 16 Groups
Diaphragm Blades: 9, Rounded
Focus Type: Autofocus
Image Stabilization: Yes
Tripod Collar: Removable and Rotating
Filter Size: 77 mm (Front)
Dimensions (ø x L): 3.7 x 7.6" / 94 x 193 mm
Weight: 3.61 lb / 1640 g