The 400mm f/4.0 DO IS USM is Canon's breakthrough in multi-layer diffractive optical lens technology. This sheds new ground for sports, nature and wildlife photographers, giving exemplary results in a size previously unheard of for a lens of such a focal length and aperture. Simply put, the size and ease of handling must be seen to be understood.
Telephoto EF 400mm f/4.0 DO (Diffractive Optics) IS Image Stabilizer USM Autofocus Lens
52mm Drop-in Gelatin Filter Holder