The Canon EF 600 mm f / 4 L IS USM mark I is my standard lens in bird photography. This 600-mm super telephoto lens is equipped with an image stabilizer (image) system. In addition, it has a large aperture of 1:4 and thus offers the finest screen performance in its class. Its auto-focus is very fast by an improved algorithm of the drive. The minimum focusing distance is 5.5 m / 18 feet. Also offer it provides excellent protection against dust and humidity and enables excellent wildlife shots.
Also the build quality of the Canon EF 600mm f/4L IS USM Lens is excellent. The focus ring and the many switches resident on the lens all work smoothly. It will be obvious to any photographer that this is a very high quality piece of professional grade equipment. The Image Stabilization (IS) is an excellent feature present on the Canon EF 600mm f/4L IS USM Lens. It will not stop subject motion, but makes a big difference in camera/lens motion. Also used on the Tripod he stops Vibration in very usefull way.
The Lens is full compatibel with the Canon EF 1,4x III Converter and 2x III Converter with excellent Picture Quality an the Fullframe Camera 5D Mark III and also on the EOS-1D Mark IV and the neuer Model EOS-1Dx. Also excellen Picture Qualtiy when I use the Lens with the new EOS 7D Mark II with the 1,6x Crop Sensor.
The Canon EF 600mm f4 L IS USM Supertelelens ist the for me the best Choice in Bird Photography and a very importend Tool also to make Video Documentations from Birds in fare Distances. Together with the 3x Crop Magic Lantern and the EOS 5D III I get the possibility to extend the focal length from 600mm to 3000 mm without any loos of Quality.
Its amaizing everytime I used again.