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Focal Length & Maximum Aperture
Built-in extender at 1.4x: 280-560mm, 1:5.6
25 elements in 20 groups (incl. 1 rear filter)
Built-in extender at 1.4x:
33 elements in 24 groups (incl. 1 rear filter)
Diagonal Angle of View
Built-in extender at 1.4x: 8°50'-4°25'
Closest Focusing Distance
Max. Diameter x Length, Weight
Compatible Supplies & Accessories
Canon offers a wide range of compatible supplies and accessories that can enhance your user experience with you EF 200-400mm f/4L IS USM Extender 1.4x that you can purchase direct. Scroll down to easily select items to add to your shopping cart for a faster, easier checkout. Visit the Canon Online Store
Drop in Gelatin WII 52MM
A holder for screw-type filters, for use with rear mounted drop-in filters. Filter fits select lenses with a 52mm diameter, please see link below for compatible lenses.
FILTER DROPIN PL-C WII 52MM
Filter Drop in Screw Holder 52II
Lens Cap E-145C
Lens Case 200-400
Lens Case Kit includes lens case and strap.
Lens Dust Cap E Rear Cap
Rear lens cap for all EF type lenses, lens extenders, and extension tubes. Used to protect the rear glass element from dust and scratches.
Lens Wide Strap B
A Modulation Transfer Function (MTF) chart measures a lens’ expected optical performance at the center of the picture area and measures repeatedly along the diagonal line, further and further toward the corners of the image. The higher a curve is shown on the chart, the better the lens is performing in the area the chart is measuring. As a curve moves from left to right, it displays the lens' results from center towards the corners.
For more information on understanding how to read Canon Lens MTF charts, please click here.
Canon EF 200-400mm f/4L USM Extender 1.4x: Deep InsideGo deep inside the high-performance super-telephoto 200-400mm f/4L USM Extender 1.4x lens and discover the impressive features and details that make up this highly versatile lens.
Canon EF 101: A Beginner's GuideCanon offers a wide range of EF lenses and lens accessories. In this 9 part video series you'll learn all about lens basics and the various lenses available from your host, Canon expert Jon Lorentz.
Canon EF 101: Lens BasicsTake a quick and informative first step into the world of lenses with Canon expert Jon Lorentz, providing insight into the type of lenses available, helpful tips and more.
Canon EF 101: Telephoto LensesTelephoto lenses let you get close in on a subject. Canon expert Jon Lorentz shows you how to get the most out of your Canon telephoto lenses.
Canon EF 101: Lens AccessoriesCanon expert Jon Lorentz takes a look at some lens accessories including lens hoods, filters, extenders and more and how to care for them.
† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.