Canon 200-400mm f/4 L IS USM EF Mount Lens {Gel} with Built-In 1.4x Extender

Canon's 200-400mm f/4L with a built-in 1.4x extender baked in.

The 25-element, 20-group optical formula includes one fluorite and four UD elements working together to suppress chromatic aberration across the full 200-400mm zoom range. Flip the extender lever at the base of the lens and you're instantly shooting at 280-560mm f/5.6, no lens swap required, no exposed rear element sitting in a dustbag while you fumble with a separate teleconverter. That single mechanical feature changes how you work at events where the action distance shifts without warning.

The ring-type USM with internal focusing and a dedicated high-speed AF processor keeps acquisition fast and quiet. Three IS modes handle static subjects, panning, and erratically moving targets, with four stops of shake compensation on tap. The Power Focus mode and Focus Preset ring make this a legitimate cinema-ready telephoto for video work where smooth, repeatable focus pulls matter. A drop-in 52mm rear filter holder lets you slot gelatin filters without stacking anything on the front of the lens.

At 7.98 lb and 14.41 inches, this is a lens you plan around, not one you grab casually. That weight buys you L-series dust and moisture sealing, fluorine coating on front and rear elements, a rotatable tripod collar, and an optical package that holds f/4 through the entire native zoom range. For photographers who work consistently at long distances and need that extender option available in a split second, the built-in 1.4x is a genuine operational advantage over carrying a separate converter.

Who It's For

Wildlife photographers working from hides or vehicles get the most direct benefit: the 280-560mm f/5.6 extender mode engages without breaking the shooting position, and three focus limiting ranges help the AF system ignore foreground clutter. Sports photographers covering field events where subject distance varies rapidly can stay on a single lens body than swapping between telephoto options. Photojournalists on assignment in unpredictable conditions rely on the dust and moisture sealing when weather turns. Filmmakers shooting nature documentaries will use Power Focus mode and Focus Preset for controlled, repeatable pulls at long focal lengths.

Key Features

• 25-element, 20-group optical formula with fluorite and UD elements
• Built-in 1.4x internal extender extends range to 280-560mm f/5.6
• Ring-type USM autofocus with internal focusing and dedicated high-speed CPU
• Four stops of image stabilization with three modes for different subjects
• Power Focus and Focus Preset for video work with smooth, repeatable pulls
• Drop-in 52mm rear filter holder for gelatin filters without front stacking
• Canon EF mount, full-frame coverage, rotatable tripod collar
• L-series dust and moisture sealing with fluorine coatings

FAQ

Can you use this lens with a separate teleconverter, or does the built-in extender prevent that?

The internal 1.4x extender is mechanical and independent of the rear element housing, so you can still attach a compatible rear teleconverter if needed, but the built-in extender eliminates the necessity in most situations.

What's the autofocus speed like at 560mm with the extender engaged?

Ring-type USM with a dedicated high-speed CPU handles focus acquisition quickly and quietly even at the extended focal length, though AF speed is slightly slower at f/5.6 than at the native f/4 aperture.

Does the lens maintain f/4 throughout the entire 200-400mm zoom range without the extender?

Yes, this is an f/4 lens across the full 200-400mm range, which is why the weight and size reflect constant maximum aperture design.

How do the three IS modes perform for different shooting scenarios?

Standard mode handles static subjects and general shake correction. Panning mode compensates for directional shake when tracking moving subjects. Exposure Only mode applies stabilization only during the actual exposure, useful for following fast, unpredictable movement.

What's the practical difference between Power Focus and manual focus for video work?

Power Focus provides smooth, motorized focus pulls at selectable speeds for cinematic transitions. Manual focus gives you direct mechanical control. Focus Preset lets you set a mark and snap back to that distance with a twist of the focus ring, useful for pull-focus choreography.

Is the 52mm rear filter holder the only way to use filters on this lens?

The drop-in rear filter holder accepts pre-cut gelatin filters without stacking on the front element. You can still use larger diameter filters on the front if needed, but the rear holder avoids adding front assembly bulk.

What's the weight and length penalty compared to a standard 200-400mm telephoto?

At 7.98 lb and 14.41 inches, this is essentially an integrated 200-560mm system in one body. You're carrying one lens instead of a 200-400mm plus separate 1.4x converter, plus a teleconverter's optics are always exposed or in a bag.