Product Description

The L-series is Canon's flagship professional lens range, designed to include outstanding image performance, ultimate operability and weather resistance. The EF 24-105mm f/4L IS USM offers a lightweight alternative to the renowned EF 24-70mm f/2.8L USM. offers the highest possible optical quality with no change in aperture over the full focal range of the lens. This allows photographers to set exposure at the widest aperture and zoom all the way through to 105mm without having to vary the shutter speed.

Image Stabilizer (IS) dramatically reduces image blur caused by camera shake. Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis. This alters the light path, returning the image to its correct position on the sensor or film plane. The 3 stop advantage means that photographers normally shooting a 105mm lens handheld at 1/125 sec can obtain a shake free result with a shutter speed as low as 1/15 sec, for vastly extended options in low light conditions.

The ring-type USM motor found in the EF 24-105mm f/4L IS USM employs ultra-sonic frequency vibrations to drive auto focus with unrivalled speed and near-silent operation. A powerful CPU and improved AF algorithm contribute to speed performance. Good holding torque stops the lens with precision and accuracy, the instant it arrives at the correct focus point and without overshoot. Photographers can choose manual focus instantly and at any time simply by moving the manual focus ring without first having to switch out of auto focus mode. Circular aperture producing attractive background defocus Inner focusing, ring USM and new AF algorithms for fast and quiet autofocusing Manual focusing enabled even during AF mode (full-time mechanical manual focus) Only environmentally friendly lead-free glass used in lens construction Filter diameter 77 mm / Dimensions (dia x len)

Product Details

• Brand: Canon
• Model: 0344B006
• Released on: 2005-11-01
• Dimensions: 2.00" h x 2.00" w x 6.00" l, 1.48 pounds

Features

• 24-105mm standard zoom lens with f/4 maximum aperture for Canon EOS SLR cameras
• 1 Super UD glass element and 3 aspherical lenses minimize chromatic aberration and distortion
• Ring-type USM system delivers silent but quick autofocus (AF); full-time manual focus
• Image Stabilizer technology steadies camera shake at up to 3 stops; weighs 23.6 ounces
• Dust- and moisture-resistant; measures 3.3 inches in diameter and 4.2 inches long; 1-year warranty

From the Manufacturer
Dust and moisture resistant and incorporating Canon's very finest standards of precision optics, the EF 24-105mm f4L IS USM is designed for reportage, event, travel, and celebrity photographers looking for a lightweight and maneuverable lens with minimal image quality compromise.

Complementing the EF 17-40mm f4L USM and EF 70-200mm f4L USM, the lens completes Canon's f4L-series zoom lens range. These lenses are designed for professional photographers requiring a light zoom lens with a fixed aperture throughout the zoom range. For outstanding camera-shake reduction, Image Stabilizer allows shutter speeds of 3 stops slower than would otherwise be possible, with no perceptible increase in image blur.

The L-series is Canon's flagship professional lens range, designed to include outstanding image performance, ultimate operability, and weather resistance. The EF 24-105mm f4L IS USM offers a lightweight alternative to the renowned EF 24-70mm f2.8L USM.

Image Stabilizer
Image Stabilizer (IS) dramatically reduces image blur caused by camera shake. Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis. This alters the light path, returning the image to its correct position on the sensor or film plane.

The 3-stop advantage means that photographers normally shooting a 105mm lens handheld at 1/125 second can obtain a shake free result with a shutter speed as low as 1/15 second, for vastly extended options in low light conditions.

Superb autofocus
The ring-type USM motor found in the EF 24-105mm f4L IS USM employs ultra-sonic frequency vibrations to drive autofocus with unrivalled speed and near-silent operation. A powerful CPU and improved AF algorithm contribute to speed performance. Good holding torque stops the lens with precision and accuracy, the instant it arrives at the correct focus point and without overshoot. Photographers can choose manual focus instantly and at any time simply by moving the manual focus ring without first having to switch out of autofocus mode.

Constant f4 aperture from 24 to 105mm
The EF 24-105mm f4L IS USM offers the highest possible optical quality with no change in aperture over the full focal range of the lens. This allows photographers to set exposure at the widest aperture and zoom all the way through to 105mm without having to vary the shutter speed. It is the perfect lens for professional photographers looking for a lightweight and extended zoom alternative to its EF 24-70mm f2.8L USM counterpart. The lens employs an almost perfectly circular barrel aperture, helping create attractive, defocused backgrounds.

Image quality
To limit lens size and improve image clarity over the total image area, an Ultra-Low Dispersion glass (UD) element is used to eliminate the secondary chromatic aberrations that otherwise reduce sharpness and introduce color fringing. Aspherical lens elements correct spherical aberration for crisp, high-contrast, corner-to-corner quality. By optimizing Super Spectra lens coatings and lens element shaping, Canon's engineers have been effective in suppressing flare and ghosting--more prone to occur with digital cameras due to reflection off the image sensor. By increasing light absorption, coatings reduce reflections off lens element surfaces to deliver crisp, undistorted images with natural color balance.

EOS system integration
The EF 24-105mm f4L IS USM includes distance metering information, providing compatibility with the E-TTL II flash system of late-model cameras such as the EOS-1D Mark II N and EOS 5D. When used in conjunction with Canon's range of EX Speedlite flash units, the lens passes distance information to the flash algorithm for markedly improved flash exposure metering. To match the weather resistance afforded by EOS-1 professional camera bodies, an O-ring seals the lens against the lens mount and numerous seals around the lens' moving components provide protection against the ingress of dust and moisture.

AF Mode and IS switches have been reshaped, making them less susceptible to being engaged or disengaged accidentally.

The EF 24-105mm f4L IS USM comes with a bayonet mount lens hood EW-83H and soft lens pouch LP1219. In keeping with Canon's Kyosei philosophy of living in harmony with the environment, the lens features only lead-free glass.

Customer Reviews

A Real Performer and Workhorse of a Lens!
The 24-105 f.4 L (my first "L" lens) was just what I was needing to replace my 5 year old Canon 28-135 that was starting to make strange noises.
First thing I did wass shoot a series of exposures using my 40D, shooting from a tripod using each of the lens' marked apertures and focal lenghts. My test target was a sheet of newspaper stretched tightlty on a wall. I was very impressed with almost every image when viewed at 100%. All I saw that I didn't really like was a little corner softness with the lens wide open at around 70mm. This lens is pretty much tack sharp, but bit heavy and could have been a stop faster considering its hefty price! One nice feature that somehow the optical magicians at Canon has pulled off though is the fact the lens is somehow able to maintain its f.4 maximum aperture throughout its entire focal lenght range!
The build quality, auto focusing and image stabilization are quite, quick and first rate.

Quality way below expectation
During extensive testing of the lens on a Canon Xsi (12MP) I found the lens to be very sharp in the center of the picture on all zoom levels, but the edge of the lens was quite another matter.

All the pictures were taken at 1/40 f4.5 ISO 400. At 24 mm the vignetting (darker corners) is very noticeable. The lens is also quite soft outside the center of the photo. The vignetting improves as the zoom increase, but the softness improves only marginally.

The build quality and feel of this lens is great, but none of those thing matters if the photographic quality of the lens is not up to par. The quality of this lens was so poor that I suspect it was defective. The lens has been returned and I am looking forward to receiving an exchange. Based on all reviews and test, this should be a much better lens than the one I tested.

Links to test photos,
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Amazing Quality
I am using this lens on a new Canon 50D 15 MP camera. Properly used, it offers perfectly clear and tack sharp photos at very high resolutions. It is smooth to operate and very fast for auto focus. On the minus side, it is somewhat heavy. It works great as an all-purpose lens for almost all situations. I leave it on almost all the time. Highly recommended and easily worth the money.