The ef 70 200mm f4l is usm is a lightweight compact l series telephoto zoom lens with image stabilizer the optical image stabilization in the new ef 70 200mm f4l is usm lens provides up to an incredible four stops of shake correction a first for canon is lenses the use of fluorite ud lens elements provides excellent optical performance in terms of resolution and contrast these features together with its water and dust proof construction provide both the performance and portability to mee