The Canon EF 70-200mm f/4L IS USM is a lightweight, weather-sealed telephoto zoom lens designed for Canon EF-mount cameras. Released in 2006, it offers L-series optical sharpness and 4-stop image stabilization in a much smaller package than Canon's f/2.8 alternatives.
Key Specifications
• Focal Length and Aperture. The lens covers a versatile 70–200mm zoom range with a constant f/4 maximum aperture.
• Optical Construction. According to Canon, the internal design uses 20 elements in 15 groups, incorporating fluorite and Ultra-Low Dispersion (UD) glass to minimize chromatic aberration.
• Autofocus and Stabilization. A ring-type Ultrasonic Motor (USM) provides fast, quiet autofocus with full-time manual override, while the built-in Image Stabilizer offers up to 4 stops of shake correction.
• Dimensions and Weight. Measuring 3.0 x 6.8 inches and weighing 26.8 oz (760g), it features internal zooming and focusing with a 67mm filter thread.
• Weather Sealing. The metal barrel includes dust- and moisture-resistant rubber gaskets, though a front filter is needed to complete the weather seal.
