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Canon EF 300mm f/4L IS USM

L series telephoto prime lens for Canon EOS SLR cameras

1 Review | 1 question - 1 answer


Our take on the Canon EF 300mm f/4L IS USM

Action and distance. two photographic challenges that become even trickier when combined. It's good news that this EF 300mm f/4 image-stabilizing lens is here to help you reach across space and capture motion-freezing shots With its fast, light-gathering f/4 maximum aperture and nimble image-stabilization technology, it provides a level of performance seldom found in a lens of its size and weight.

Long-distance problem solver

Action and distance. two photographic challenges that become even trickier when combined. It's good news that this EF 300mm f/4 image-stabilizing lens is here to help you reach across space and capture motion-freezing shots With its fast, light-gathering f/4 maximum aperture and nimble image-stabilization technology, it provides a level of performance seldom found in a lens of its size and weight.

This lens has all of the precision optical technology you've come to expect from Canon. Ultra-low dispersion (UD) elements and sophisticated coatings provide for great dirt and oil resistance with a minimum of ghosting and chromatic aberration. And the two image-stabilization modes will allow you to shoot at slower shutter speeds, increasing your ability to shoot in lowere light levels.

Created for the enthusiast

Weather-resistant and outfitted with full-time manual focus, this lens is an ideal tool for the news/nature/sports shooter on the move. An eight-bladed iris, at wide aperture, helps create smooth background blurs that make your foreground subject pop. With all this going for it, you'll probably find it living in the most accessible part of your kit bag.

Product Highlights:

  • EF 300mm f/4L IS USM telephoto lens
  • compatible with Canon EOS film and digital SLR cameras
  • effective focal length:
    • 300mm with full-frame digital or film cameras
    • 390mm with APS-H sensor cameras
    • 480mm with APS-C sensor cameras
  • Canon pro-quality L Series lens for superior image sharpness and durability
  • Image Stabilization allows in-focus shots with longer exposure times (up to two stops slower shutter speed)
  • two Optical Image Stabilizer modes:
    • Mode 1 provides optimum performance with stationary subjects
    • Mode 2 provides a smoother view through the finder when horizontally or vertically panning moving subjects
  • two UD (ultra-low distortion) elements deliver sharper images with less chromatic aberration
  • ring-type Ultrasonic Motor (USM) for fast, silent autofocus
  • lightweight and durable
  • dust-proof and water-resistant design
  • available full-time manual focusing
  • minimum focus distance: 4.9 feet
  • lens construction: 15 elements in 11 groups
  • filter size: 77mm
  • lens is 8-15/16" long, 3-9/16" in diameter
  • weight: 2.6 lbs.
  • warranty: 1 year
  • Our 60-day money-back guarantee
Supplied Accessories:
  • tripod mounting foot
  • built-in lens hood
  • front and rear lens caps
  • carrying case

What's in the Box:

  • EF300mm f/4L IS USM
  • E-77 II Front lens cap (installed)
  • Rear lens cap (installed)
  • Tripod Mount Ring B (W) (installed)
  • Zippered storage case (LZ-1128)
  • Case strap
  • Instructions on CD-ROM
  • EF Lens Quick Guide
  • Warranty/Product Registration card

Canon EF 300mm f/4L IS USM Reviews

Average Customer Review(s):

(1 Review)

Canon EF 300mm f/4L Lens

timfxf from Metro NYC area on 3/3/2014

Crutchfield Customer Review (What's this?)

I got this lens to replace my Canon 300 2.8 lens. I now have a Canon 200-400 f4 EX 1.4 that I primarily use for sports. The old 300 was the one I used to use for that purpose. Now I find that I still need the 300 mm size for daily news assignments, but don't want to carry the extra bulk of the 2.8. The 300 f4 is very light and almost as compact as the 70-200. It packs easily into my "everyday bag" while the 200-400 is only brought out for sports or where longer glass is needed. IMPORTANT: I must state here that all of this is predicated on using Canon's 1D X or it's 5D Mark III, with its ability to shoot quality photographs at higher ISO's. Those bodies render useless the need for a 2.8 lens aperture (in most cases).

Pros: Sharp. Lightweight - no need for a monopod. Built-in lens shade is very convenient. Not much longer than a 70-200. Easy to pack.

Cons: It has the dreaded Canon tripod/monopod ring that, in time, degrades. Never carry a lens on a removable ring with a monopod unless the camera is attached. The lens can slip out of the ring and smash into the ground. (Don't ask how I know this.)


Hands-on research

Features and Specs

Mount Type Canon EF-mount
Sensor Size Full frame
Image Stabilization Yes
Lens Type Telephoto
Focal Length 300mm
Maximum Aperture f/4
Weight 42 ounces
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The Canon EF300mm f/4L IS USM lens is a high-performance telephoto lens for use with Canon EOS cameras. The lens features a built-in Ultrasonic Motor (USM) for quick and quiet autofocusing, and an Image Stabilizer. The lens is constructed of 15 elements in 11 groups, including UD (ultra-low dispersion) elements for excellent imaging capability.

Image Stabilizer (IS): The built-in Image Stabilizer can be used in the AF (autofocus) or MF (manual focus) modes. The Image Stabilizer starts operating when you press the shutter button halfway, and gives the equivalent effect of a shutter speed two stops faster. Two switches located on the barrel of the lens allow you to turn the image stabilizer on and off, and switch between the two stabilizer modes:

  • Mode 1: used for normal photography; corrects vibrations in all directions
  • Mode 2: corrects vertical camera shake during following shots in a horizontal direction; also corrects horizontal camera shake during following shots in a vertical direction.

Focus Modes: The EF300mm lens is equipped with a two-way switch for setting the Focus Mode. You can choose from AF (auto focus) or MF (manual focus). In Manual Focus mode, you can focus on your subject by turning the focus ring. The focusing ring always works, regardless of the focus mode.

Focus Range Switch: You can switch between two focusing ranges using the two-way switch on the barrel of the lens. You can choose from a range of 1.5 meters (4.9') to infinity, or a range of 3 meters (9.8') to infinity. Depending on your subject matter, the correct choice of focus range can reduce the auto focusing time.

Lens Hood: The built-in, non-detachable lens hood cuts out unwanted light and protects the lens from rain, snow, and dust. Extending the lens hood adds approximately 2-3/8 inches to the overall length of the lens.

Tripod Mount: The included tripod mount ring allows you to mount the camera onto a tripod by the lens instead of the camera body. You can loosen the orientation lock knob on the tripod mount and rotate it as needed for switching between vertical and horizontal positions.

Display Window: The EF300mm lens has a display window on the barrel near the focus range switch that provides the following:

  • Infinity Compensation Mark: The lens provides an "L" infinity mark to compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L mark is aligned with the distance indicator on the distance scale.
  • Infrared Index: The infrared index corrects the focus setting when using monochrome infrared film.

Optional Lens Extenders: The lens is compatible with EF1.4x II and EF2x II lens extenders (sold separately). The extenders will increase the focal length to 420mm (EF1.4x) and 600mm (EF2x).


  • Focal Length: 300mm
  • Minimum Aperture: f/32
  • Maximum Aperture: f/4
  • Minimum Focus Distance: 4.9 feet
  • Filter Diameter: 77mm
  • Angle of View:
    • Diagonal: 8° 15'
    • Vertical: 4° 35'
    • Horizontal: 6° 50'
  • Dimensions: 3.559" Diameter, 8.902" Length, 42 Ounces

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

because i cant afford a 500 f4 [ david  Jul 19, 2016 ]

1 question already asked

The lens is 8-15/16" long, 3-9/16" in diameter. It weighs 2.6lbs. While you can easily hold the lens, it also features a built-in tri-pod mount with an orientation lock. You will find this information, and more, by clicking the "Details" tab on the lens's main weboage. I hope that helps. My Bio: [ Ryan  Jun 23, 2017 ]  Staff