Sigma Corp have introduced some new products, and have had a rethink about how they will promote and describe their optical line up. First here are some details of the new 17-70mm f/2.8-4 for APS sensor size cameras:
Mainly used for general-purpose photography, this everyday lens covers a range equivalent to 25.5-105mm on a 35mm camera.
A large-aperture lens that opens up to F2.8, it’ s surprisingly compact in size. Great for treasured snapshots of travel or family occasions, it also handles shots that are a little bit more creative. Designed to be the kind of lens you carry around with you all the time, it delivers simplicity and is so user-friendly that’s sure to satisfy even the most demanding of users.
Price: TBD | Launching Date: TBD
Corresponding AF Mounts: TBD | Accessory: Lens hood (LH780-03)
* The Appearance and specifications are subject to change without notice.
1.Excellent for macro photography
This lens has the minimum focusing distance of 22cm throughout the entire zoom range and a maximum magnification ratio of 1:2.9. The size and framing can be adjusted by rotating the zoom ring, making macro photography easier than using a fixed focal macro lens. For further convenience, the maximum magnification ratio at each focusing distance appears on the side of the lens barrel.
2.Optical Stabilizer (OS)
Sigma’ s own unique OS (Optical Stabilizer) function is incorporated. It offers effective correction of approximately 4 stops, which makes it possible to compensate camera shake even in macro range photography where a small blur can be easily identified.
3.Superior optical performance
FLD (“F” Low Dispersion) glass, that has a performance equal to fluorite, and SLD (Special Low Dispersion) glass are used for maximum correction of chromatic aberration. Three aspherical lenses, including a double-sided aspherical lens together with the latest design, prevent and correct all types of aberrations including astigmatism, achieving high quality images throughout the entire zoom range.
4.New material TSC (Thermally Stable Composite)
The new material “TSC (Thermally Stable Composite)”, which has little contractility especially in temperature changes, as well as maintaining firmness, is incorporated into the lens barrel. Com-pared to Polycarbonate which is generally used, TSC has higher elasticity by approximately 25%. Since thermal shrinkage is low, it has
high affinity to metal parts which contributes to high quali-ty product manufacturing. It also allows other parts such as the zoom ring and scaling to be small-er.
5.Flare and ghosting conscious design
From an early stage, flare and ghosting are thoroughly measured to establish the design which is resistant to strong incident light such as backlight. Sigma’ s Super Multi-Layer Coating reduces flare and ghosting, and provides high contrast images even in backlit conditions. The supplied pet-al-type hood can be attached to block out extraneous light which has a harmful influence on the ren-dering of the lens and prevents internal reflections.
6.Brass made bayonet mount
This lens incorporates a brass made bayonet mount which has both high accuracy and durability. The special treatment to reinforce its strength is applied to the surface to make it a high quality lens that will easily withstand long-term use.
Lens Construction:16 elements in 14 groups | Minimum aperture:F22 | Filter s_ize:ø72mm Angle of view (SD1):79.7 ° – 22.9 ° | Minimum focusing distance:22cm | Dimensions (Diameter x Length):ø79mm x 82mm/3.1in x 3.2in | Number of diaphragm blades:7(Rounded diaphragm) | Maximum magnification ratio:1:2.9 Weight:470g/16.6oz
SIGMA GLOBAL VISION: www.sigma-imaging-uk.com