Canon EF 100-400mm lens
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|EF 100-400mm f/4.5-5.6L IS USM|
|Short back focus:||No|
|Unique features:||Push/pull zoom|
|Focal length:||100–400 mm|
|Frame coverage:||Full frame|
|Aperture (max/min):||f/4.5-5.6 to f/32-40|
|Construction:||14 groups / 17 elements|
|# Diaphragm blades:||8|
|Max. diameter:||92 mm (3.6 in)|
|Max. length:||189 mm (7.4 in)|
|Weight:||1,380 g (3.0 lb)|
|Filter diameter:||77 mm|
|Angle of view|
|Horizontal:||20° – 5°|
|Vertical:||14° – 3°|
|Diagonal:||24° – 6°|
The EF 100-400mm f/4.5-5.6L IS USM is a professional EF mount telephoto zoom lens introduced by Canon Inc. in September 1998. It is a high performance tele-photo lens ideal for sports and wildlife photography which has received high ratings from purchasers at Amazon.com and B&H Photo Video . Photographers using APS-C cameras must apply a crop factor of 1.6x, effectively bringing the focal range to 160-640mm. This is an advantage for crop body users as it is a relatively cheaper alternative to the long prime lenses that cost significantly more.
This lens is compatible with the Canon Extender EF tele-converters on newer EOS bodies. Auto-focus works only on the 1.4× Extender (and only with cameras that can autofocus at f/8) and image stabiliser (IS) works with both 1.4× and 2× Extenders. The newer copies of these lens are more consistent and very sharp 3 to 4 years after its first launch. The best compromised lens for Canon, not as sharp as prime or 70-200mm f/2.8 IS II or 70-200mm f/4 IS but close enough and far better than consumer lenses, well build and smooth zoom.
Whilst an excellent performing lens optically, the design originated before the large scale advent of digital single lens reflex cameras. The 'trombone' nature of the design necessitates that the lens sucks in air when zoomed from shorter focal lengths to longer focal lengths. Unfortunately, with the lack of anything to prevent it, it also sucks in any airborne dust. Although this was not considered a problem when used with cameras that used photographic film, the dust can settle on the sensor of digital cameras leaving a permanent mark on every subsequent photograph until it is cleaned off. Newer cameras with dust reduction systems have mitigated this problem somewhat.
Media related to Canon EF 100-400mm F4.5-5.6L IS USM at Wikimedia Commons
- Canon published lens data – The EF 70-200mm f/2.8L IS; EF 70-200mm f/4L IS USM and EF 75-300mm f/4.5-5.6L USM are the only lenses to have dust sealing.