The definition of versatility, the Canon EF-mount Sigma 24-105mm f/4 DG OS HSM Art Lens for Canonfrom Sigma 24-105mm f/4 DG OS HSM Art Lens for Canonis an Art-series zoom covering a useful wide-angle to short-telephoto range. Featuring a constant f/4 maximum aperture, this lens strikes an ideal balance between a portable form factor along with a bright enough design for working in available lighting conditions. Complementing this design, an Optical Stabilizer helps to minimize the appearance of camera shake throughout the zoom range for sharper handheld shooting. A Hyper Sonic Motor also contributes to intuitive handling and provides especially fast and quiet autofocus performance along with full-time manual focus override.

Complementing the physical design, this lens is also distinguished by its advanced optical layout, which include a series of low dispersion elements and three aspherical elements. These specialized elements reduce chromatic and spherical aberrations throughout the zoom range in order to realize a high degree of sharpness and clarity. Additionally, a Super Multi-Layer Coating has also been applied to individual elements to suppress lens flare and ghosting for improved contrast and color rendering in strong lighting conditions.

EF-Mount Lens/Full-Frame Format    Aperture Range: f/4 to f/22    Two FLD Elements, Two SLD Elements    Three Aspherical Elements    Super Multi-Layer Coating    Hyper Sonic Motor AF System    OS Image Stabilization    Rounded 9-Blade Diaphragm

As part of the Art line within Sigma's Global Vision series, this lens is designed to achieve truly notable optical performance and is ideally suited for creative and artistic applications.

Standard zoom is designed for full-frame Canon EF-mount cameras, however can also be used with APS-C models where it provides a 38.4-168mm equivalent focal length range.

Constant f/4 maximum aperture maintains a portable form factor and also offers consistent performance throughout the zoom range.

Two F Low Dispersion (FLD) elements and two Special Low Dispersion (SLD) elements markedly reduce chromatic aberrations and color fringing throughout the zoom range for improved clarity and color accuracy.

Three aspherical elements control spherical aberrations and distortion for increased sharpness and accurate rendering.

A Super Multi-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions.

Integrated HSM (Hyper Sonic Motor), along with an internal focusing system, realizes quick and quiet autofocus, which is further complemented by an optimized AF algorithm to produce smoother focusing performance. The HSM also permits full-time manual focus control simply by rotating the focus ring at any time.

Optical Stabilizer system minimizes the appearance of camera shake to benefit making sharper imagery when shooting handheld.

Rounded nine-blade diaphragm is constructed from durable, fluorine-coated polycarbonate and also features a carbon feather film for smooth performance when working with fast continuous shooting rates.

Constructed using a Thermally Stable Composite (TSC) material for greater precision and use in wide temperature variations. Additionally, a brass bayonet affords improved mounting accuracy and rigidity.

This lens is compatible with the optional Sigma USB Dock for fine-tuning different lens characteristics and updating its firmware.

Related Questions and Answers

Q: 1. Is this lens parfocal?

A: No, the lens is not pafocal. You must refocus.

Q: 2. Does this lens feature hard stops for focusing?

A: There are no hard stops. In fact distance indicator is not accurate - it changes depending upon zoom. Also, if you are focused on something and change the zoom, the focus will also change. For example, in dim light focused near infinity will be out of focus if you change the zoom. Very annoying. Nikon lenses do not do this.

Q: 3. Is this lens compatible with Nikon F100 35mm film camera?

A: Yes, the Sigma 24-105mm f/4 DG OS HSM Art Lens (Nikon F) is compatible with Nikon F100 35mm film camera.

Q: 4. What about the mismatch with Canon 6d's internal GPS? Has it been resolved?

A: If you have the Sigma USB dock and can download the latest firmware, the GPS issue appears to be resolved. It worked on mine.

Q: 5. Will this lens work on my Nikon f80 or F100 film cameras with full functionality?

A: On the F100 I am almost positive it will. I am not familiar with the F80. It's an amazing lens.

Q: 6. Is it weather-sealed? Is it true that all Sigma Art and Sport-series lenses are weather-sealed?

A: No, unfortunatelly it's not true.. Sigma Art seies are not weather sealed.. I own 3 of art series lenses , and they all are not weather, or even dust sealed... So , be very careful with them... However , optically they are very good.....

Q: 7. Is this lens fast enough for indoor basketball???

A: The f4 is probably too slow. I also found the lens wouldn't pass, travelled more than once, and only attempted three pointers.2/5 - wouldn't recommend as a teammate

Q: 8. Can someone explain more about the dock mentioned in the description, how much, what it's used for, etc? Thanks!

A: I have the dock and found it VERY useful for re-setting focus for Sigma 35mm 1.4 Art and 50mm 1.4 Art both are stellar lenses. Rather than just use the body and set focus closer or the like, this allows you to set the focus near/far at about FOUR different focus ranges. Example: 14 - 18 then 18 - 24 then 24- 38 then 38 - infinity -- those are just *guesses* at the ranges. I don't remember. But extensive testing showed that the lenses needed maybe +4 at the near range, +2 at mid range and -1 at infinity. You cannot do that with the camera body. And with a zoom, I'd imagine it to be even more important/useful.

Q: 9. Would this work with the Sony FS5? I would us a metabones speedboost adapter.

A: I have a different adapter which works with EOS lenses on the A55 (et alia) so there is no problem in concept. I suggest you research the Metabones adapter rather than the lens to see what level of performance you can expect.

Q: 10. is this lens good for portraits?

A: yes. it's a great all around lens. super sharp. you could always wait for a 2.8 24-70 from their Art line, but the 105 is a longer reach.