Canon Canon EF Telephoto Zoom

EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender

100-400mm
f/100.0
Telephoto Zoom

Quick answer

The Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender is a short telephoto to super telephoto telephoto zoom lens covering 100-400mm at f/100.0 for the Canon EF mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.

About this lens

Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender: a telephoto zoom lens with a 100-400mm focal length and a maximum aperture of f/4.5-5.6, made for Canon EF mount cameras, from the Canon L series with Image Stabilizer and ultrasonic-motor autofocus. A versatile L-series super-telephoto zoom with image stabilization for wildlife, sports and aviation.

Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender specifications

Brand: Canon
Mount: Canon EF
Focal length: 100-400mm
Maximum aperture: f/100.0
Lens type: Telephoto Zoom

What can you shoot with the Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender?

At 100-400mm this is a short telephoto to super telephoto telephoto zoom, which typically suits:

Portraits with a flattering perspective
Events and weddings
Isolating subjects from the background
Sports and action
Wildlife and birds at moderate distance

Its smaller maximum aperture favours daylight shooting and keeps the lens compact.

Full-frame equivalent and field of view

Calculated from the focal length and crop factor. Not measured.

Sensor	Crop	Equivalent	Horizontal FOV	Diagonal FOV
Full frame	1.0x	100–400mm	5.2–20.4°	6.2–24.4°
APS-C	1.6x	160–640mm	3.2–12.8°	3.9–15.4°

Try the field-of-view calculator

Frequently asked questions

What mount does the Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender use?

It uses the Canon EF mount, so it fits Canon EF cameras directly.

What is the focal length of the Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender?

It zooms across 100-400mm with a maximum aperture of f/100.0. That makes it a short telephoto to super telephoto lens.

Is the Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender a prime or a zoom lens?

It is a zoom lens covering 100-400mm, so you can reframe without moving. Its maximum aperture is f/100.0.

What is the Canon EF 100-400mm f/4.5-5.6L IS II USM + 1.4x extender equivalent on a crop sensor?

On APS-C (1.6x crop) it frames like 160–640mm on full frame, with a 3.2–12.8° horizontal and 3.9–15.4° diagonal field of view. These figures are calculated from the focal length and crop factor.