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The Sigma 18-35mm f/1.8 DC lens is a major achievement in lens design. Now you can obtain the image quality and fast aperture of a prime lens in a standard zoom. It has an amazing f/1.8 maximum aperture, the first ever zoom lens to achieve ths aperture throughout the zoom range – for excellent viewfinder brightness, low light capability and control over depth of field. Also with a rounded diaphragm for pleasing bokeh (softness to defocused areas of an image when stopped down).
It is a DC series lens for APS-C format aned serves as a standard zoom lens (27-52.5mm equivalent in 35mm format, slightly varies with camera used) As part of Sigma’s newly developed Art range, it places image quality and ease of use above compactness or range of functions.
To achieve this specification, many technologies have been employed by Sigma. Included are features such as a wide glass moulded aspherical lens using the latest production techniques filtered down from the manufacture of super-wide lenses. Another optical feature is the use of SLD (Special Low Dispersion) glass for optimised power distribution of the optical elements as well as compensation of various aberrations and curvature of field at the widest angle setting.
Focusing is fast and quiet by use of the HSM (Hyper Sonic Motor) which has full time manual focus override, internal focusing and zooming so there is no change in length of lens when focusing or zooming, ideal for attaching polarisers and other specialist filters.
Flare and ghosting are kept well under control with Super Multi Layer Coating and an included petal hood, and close focusing is possible with a 28mm minimum focus (1:4.3 macro).
The 18-35mm is a well-made lens, using TSC (Thermally Stable Composite) for the lens barrel and a hard surface treated brass bayonet mount.
Compatible with the optional Sigma USB Dock for firmware upgrades to the lens.
|Lens Construction||17 elements in 12 groups|
|Angle of View (for SD1)||76.5 - 44.2 degrees|
|Number of Diaphragm Blades||9 Blades (Rounded diaphragm)|
|Minimum Focusing Distance||28cm / 11.0in.|
|Filter Size||Diameter 72mm|
|Dimensions||Diameter 78mm x 121.0mm / 3.1in. x 4.8in.|
|Weight||810g / 28.6oz.|
Sigma’s Art line delivers high-level artistic quality
Sigma is organizing all its interchangeable lenses into three product lines; Contemporary, Art and Sports. Designed with a focus on sophisticated optical performance and abundant expressive power, the Art line delivers high-level artistic expression. Developed with the maximum emphasis on artistic touch, Art lenses are designed to meet the expectations of users who value a creative, dramatic outcome above compactness and multifunction. Along with landscapes, portraits, still-life, close-up and casual snaps, they are perfect for the kind of photography that unleashes the inner artist. Ideal for studio photography, they offer just as much expressive scope when capturing architecture, starry skies, underwater shots and many other scenes.
A zoom lens is very convenient as it offers various angles of view just by rotating the zoom ring. However, the down side was that no zoom lens ever offered a faster aperture than f2.8 which led photographers to select fixed focal length lenses for brighter images. While the aperture value of prime lenses is superior to zoom lenses, their field of view is always the same, and therefore it was always necessary to carry many fixed focal length lenses. SIGMA 18-35mm F1.8 DC HSM is a new generation lens that can deliver images at f1.8 aperture throughout its focal length. The resultant bright viewfinder image is very helpful for checking the focus and composition of the image. If it is compared with a lens of F2.8, the faster shutter speed and the shallow depth of field of F1.8 further expands creativity. From wide to standard range this lens offers the excellent versatility and performance of multiple fixed focal length lenses.
Fruit of cutting edge technology
To achieve a wide zoom lens with a maximum aperture of f1.8, various technical problems need to be overcome. As the aperture value gets larger, the depth of focus becomes shallower, thus it makes the lens design extremely complicated in order to compensate for various distortions, such as spherical, axial chromatic and astigmatic aberration along with curvature of field. In order to compensate for astigmatic aberration across the entire focal range, Sigma relied on the experience and know-how gained when designing their super wide angle zoom lenses such as the 12-24mm F4.5-5.6 II DG HSM and 8-16mm F4.5-5.6 DC HSM lenses. In addition, the technological innovation at their Aizu factory contributes to better lens production. It has enabled the development of a wide glass-moulded aspheric lens, and the incorporation of SLD (Special Low Dispersion) glass for optimized power distribution of the optical elements and compensation for various aberrations as well as curvature of field at the widest angle. Thanks to Sigma’s knowledge of lens design accumulated over a long period of time plus the latest lens manufacturing techniques, they have finally made the dream of a zoom lens with F1.8 throughout its entire focal range come true.
Convenient handling is achieved by incorporating internal focusing and zooming which prevents any change in the length of the lens when focusing and zooming. It is possible to use a specialist filter, such as a Circular Polariser, as the front part of the lens does not rotate.
Designed to minimize flare and ghosting
Flare and ghosting were thoroughly measured and monitored from an early stage in the lenses development to establish an optical design which is resistant to strong incidental light such as backlight. The Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images even in backlit conditions. Attaching the matched petal type hood, which is supplied, will provide extra protection from flare and ghosting.
Minimum focusing distance of 28cm
With a minimum focusing distance of 28cm and a maximum magnification ratio of 1:4.3, this lens is excellent for close-up photography.
Hyper Sonic Motor
The HSM (Hyper Sonic Motor) ensures a silent, high-speed AF function. Optimizing AF algorithm, smoother AF is achieved. It also enables full-time manual focusing capability which allows sensible focus adjustment by simply rotating the focus ring.
Incorporating Rounded diaphragm
The 9 blade rounded diaphragm creates an attractive round bokeh at large-aperture settings.
The new product lines incorporate rubber for the attachment part of the provided lens hood. For better usability, the designs of the lens cap and AF/MF changeover switch have been improved. In order to ensure high accuracy of the product, all metallic parts and the new compound material, TSC (Thermally Stable Composite), which has a high affinity to metal parts, are housed internally. On the lens barrel, the last three digits of its release year are engraved so the lens can be identified according to the year of its launch.
Brass made bayonet mount
This lens incorporates a brass made bayonet mount which has both high accuracy and durability. A special treatment to reinforce its strength is applied to the surface giving it greater strength and making it highly resistant to long-term use.
Newly developed “USB DOCK” exclusively for new product lines
Based on these new lines, Sigma 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”
Sigma used to measure lens performance with MTF measuring system using conventional sensors. However, they have now developed their 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 quality control inspections. The SIGMA 18-35mm F1.8 DC HSM will all be checked using this “A1” before they are shipped.