Canon EF 400mm f/5.6 L USM is relatively easy, but very sturdy construction. It was long and narrow in your hands – and feel lighter than that. This was similar to the Canon EF 300mm f/4.0 L IS USM. Built-in slide-out lens hood is very comfortable. A member of the Canon L Series Lens Canon EF 400mm f/5.6 L USM “optical and mechanical performance overall is very good. 400 L 5.6 internally very quickly and quietly focused) partly due to the ring-type USM (ultrasonic motor. FTM (Full Time Manual) is a function of focus, and turn not installed filters.

CA (chromatic aberration) is quite well. Hue, saturation and contrast is excellent. Bokeh (background blur quality) is very good, also thanks to an 8-blade aperture. Vignetting is quite well. Under present very low distortion, but is not in most (if available) to see your pictures. 

Canon EF 400mm f/5.6 L USM doing extraordinary sharpness in the department. Even wide open, the 400 f/5.6 produces very sharp images to the corners of the Full Frame – That is, if you are still during the recording lens …

What is missing from this lens, in my opinion, is the IS) (Image Stabilization. Hand in hand with a 400mm f/5.6 lens takes a lot of light, high ISO settings and / or very strong arm. Many people use this lens handheld without a problem, but I think a big improvement in IS Canon EF 400mm f/5.6 L USM. With a stable tripod or monopod can solve this problem.

Weather seal is missing, another option would be that the Canon EF 400mm f/5.6 L USM useful – the lens is to use mainly seen in the open.

Canon EF 400mm f/5.6 L USM lens is the best and make the Canon EF 1,4 x Extender compatible. Do note that at the autofocus will not be lost-pro Canon body when using this combination. 1-series body’s ability to maintain AF, but only with the center AF point. Adds 1.4x barrel distortion, CA and some reduction in sharpness. 400 f/5.6 is also compatible with Canon EF Extender 2x. No body, Canon 800mm auto focus and aperture 11 is a combination of better image quality degradation will be visible. Expect a very dark viewfinder when using the 400 + 2x Combo. What is important is less important that the diameter of the lens mount 400 in a somewhat narrower than the extender.

If a seller who has earned a good reputation, a good tripod and padded collar Canon LZ1132 cases in the Canon EF 400mm f/5.6 L USM.

Canon EF 400mm f/5.6 L USM for bird photography offering and especially the birds in flight as popular as much coverage at a reasonable cost in a relatively light package. Good performance vignetting help even the blue sky as they should be – blue uniform. Other applications include animal photography, and general well-lighted sports fields.