The Canon EF 100-400mm f4.5-5.6L IS USM Lens has an excellent focal length range that includes the longest focal length found in a Canon zoom lens - 400mm.
This long focal length and focal length range combine with very good image and build quality to make the 100-400 one of the most popular serious wildlife and sports lenses Canon sells.
The push/pull zoom mechanism is possibly the most noticeable physical feature of this lens. There is a ring on the back of the manual focus ring that adjusts the tension on the zoom part of the lens.
Some may consider the Canon EF 100-400mm f/4.5-5.6 L IS USM Lens to be a slow (aperture) lens.
100mm f4.5 lens is slow, but a 400mm f5.6 is not too bad (relatively speaking). CA is basically absent from 135mm through 200mm.
The first EF lens with a zoom range from 100mm to 400mm, the EF 100-400mm f/4.5- 5.6L IS USM lens offers high resolution, superb contrast, neutral color balance, and Canon's original built-in Image Stabilizer function.
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