Sigma 17-70mm f/2.8-4 Contemporary DC Macro OS HSM Zoom Lens (for Canon EOS Cameras)
Covers all your everyday needs plus macro functionality.
The Sigma 17-70mm f/2.8-4 Contemporary DC Macro OS HSM Zoom Lens (for Canon EOS Cameras) is the first lens in the Contemporary line of Sigma's Global Vision. The Sigma 17-70mm f/2.8-4 was designed to be the ideal all-purpose lens for APS-C DSLRs. With a versatile focal length and macro capability, it is also equipped with a Hyper Sonic Motor (HSM) and an Optical Stabilizer (OS) for superior image quality. The HSM ensures quiet, accurate, and fast autofocusing while the OS compensates for camera shake when shooting handheld.
The design of the 17-70mm includes state-of-the-art TSC material (Thermally Stable Composite), which allows for a durable construction as well a reduction in size by 30% compared to conventional models. Two FLD glass elements (with performance equal to fluorite) are incorporated along with one SLD element to reduce color aberration at the highest degree and obtain unmatched image quality. The 17-70mm f/2.8-4 is compatible with the Sigma USB dock for an increased level of customization, including firmware updates as well as focus parameter adjustment changes. The perfect all-purpose travel lens, the 17-70mm f/2.8 is a must have for any camera bag.
Contemporary line can handle all sorts of photo opportunities:
Sigma is organizing all its interchangeable lenses into three product lines; Contemporary, Art and Sports. Featuring the very latest technology, and combining optical performance with compactness, the Contemporary line covers a wide range of needs. Incorporating the very latest technology in these lenses, Sigma has solved the difficult problem of keeping size and weight low without compromising optical performance. The SIGMA 17-70mm F2.8-4 DC MACRO OS HSM is the first product from the Contemporary line. Featuring a wide zoom range, the lens has a focal range equivalent to 25.5-105mm on a 35mm lens.
Excellent for macro photography:
This lens' minimum focusing distance is 22cm and the maximum magnification ratio is 1:2.8. At 70mm, the working distance becomes 5.52cm. When it comes to telephoto, it can shoot pictures with a similar sensation to a macro lens. Also, without the need to change the lens, it enables photographers to take a close up pictures of subjects such as jewelry and flowers. In order to secure a clear field of view, the design of this lens is very thorough, even down to the precise position of the engraved letters on the lens.
30% Smaller Than Conventional Models:
For a which is used lens used in everyday situations, the small size makes a big difference. By incorporating a smaller OS unit and optimizing the structure and power distribution of optical elements, the lens barrel has now become more compact. In order to ensure high accuracy of the product, the new compound material TSC (Thermally Stable Composite), which has high affinity to metal parts, is introduced for the lens barrel. It results in better durability of the parts and smaller zoom rings and scale rings. The dimension of this lens is 30% smaller than our conventional models.
Superior Image Quality Throughout The Entire Zoom Range:
This lens incorporates 2 FLD ("F" Low Dispersion) glass elements, which have performance equal to fluorite, 1 SLD (Special Low Dispersion) glass element and 3 aspherical glass lenses including double sided aspherical lens. By optimizing the power alignment of the lens, both chromatic aberration of magnification and axial chromatic aberration have been corrected. From infinity to macro, it achieves superior image quality through entire zoom range. This lens offers extraordinary expressive power and is capable of surpassing the requirement of the rigorous checking process of our new MTF measuring system "A1".
Large maximum aperture of f/2.8:
The aperture value is F2.8 at the wide end (17mm), and is F4 at the telephoto end (70mm). The bright viewfinder aids focusing and composition of images. The fast apertures also offer useful functions such as fast shutter speeds to prevent an object from being blurred and ensuring a smooth bokeh in the background.
Sigma's own unique OS (Optical Stabilizer) function is incorporated. It offers effective correction of approximately 4 stops, which makes it possible to compensate for camera shake even in macro range photography where a small blur can be easily identified.
|Without Optical Stabilizer
||With Optical Stabilizer
Flare and ghosting conscious design:
In order to achieve high rendering on this flagship lens, flare and ghosting were thoroughly measured from an early stage to establish an optical design which is resistant to strong incident light such as backlight. The Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images even in backlit conditions.
Incorporating Rounded Diaphragm:
The 7 blade-rounded diaphragm creates an attractive blur to the out-of-focus areas.
Brass made bayonet mount:
This lens incorporates brass made bayonet mount which has both high accuracy and solidity, same as the mount for camera body. The special treatment to reinforce the strength is applied on the surface to make it a high quality lens that is resistant for long-term use.
Ease of use:
The new product lines incorporate rubber for the attachment part of the provided lens hood. For better usability, the design of the lens cap and AF / MF changeover switch has been improved.
Newly developed "USB DOCK" exclusively for new product lines:
Based on these new lines, we have developed special software (SIGMA Optimization Pro) that can update the lens firmware and adjust parameters such as focus. Evaluation with Sigma's own MTF measuring system "A1" We used to measure lens performance with MTF measuring system using conventional sensors. However, we have now developed our own proprietary MTF (modulation transfer function) measuring system (A1) using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections.