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Sigma announces five Four Thirds lenses
By Michael R. Tomkins, The Imaging Resource
(Sunday, February 26, 2006 - 11:00 EST)

In its second announcement of the day, Sigma Corp. has released details of five new lenses for the Four Thirds system, as used in digital SLRs from Olympus (and soon Panasonic, as well).

The newly announced lenses include two DC models (the 30mm F1.4 EX DC HSM and 18-50mm F2.8 EX DC), and three DG types (the MACRO 105mm F2.8 EX DG, APO MACRO 150mm F2.8 EX DG HSM, and APO 50-500mm F4-6.3 EX DG HSM). The five vary in weight from a low of 410 grams for the 30mm prime up to 1830 grams for the 50-500mm zoom, and feature aperture diaphragms with from seven to nine blades. Maximum magnification for the lenses varies from 1:10.4 through to 1:1, depending on the lens model.

Specifications and photos for all five lenses follow below, along with the official press release:

Sigma 30mm F1.4 EX DC HSM
Mount Type Four Thirds
Minimum Aperture F16
Lens Construction 7 Elements in 7 Groups
Angle of View 39.6°
Number of Diaphragm Blades 8pcs
Minimum Focusing Distance 40cm (15.75”)
Maximum Magnification 1:10.4
Filter Size 62mm
Lens Hood Petal Hood
Dimensions Diameter 77.8mm (3.1”) x Length 63.9mm (2.5”)
Weight 410g / 14.5oz
 

Sigma 18-50mm F2.8 EX DC
Mount Type Four Thirds
Minimum Aperture F22
Lens Construction 15 Elements in 13 Groups
Angle of View 62.0°-24.4°
Number of Diaphragm Blades 7pcs
Minimum Focusing Distance 28cm (11.03”)
Maximum Magnification 1:5
Filter Size 67mm
Lens Hood Petal Hood
Dimensions Diameter 70.2mm (2.8”) x Length 89.5mm (3.5”)
Weight 460g / 16.2oz
 

Sigma MACRO 105mm F2.8 EX DG
Mount Type Four Thirds
Minimum Aperture F22
Lens Construction 11 Elements in 10 Groups
Angle of View 11.8°
Number of Diaphragm Blades 8pcs
Minimum Focusing Distance 31.3cm (12.33”)
Maximum Magnification 1:1
Filter Size 58mm
Lens Hood Bayonet type Hood (Screw-in)
Dimensions Diameter 55.2mm (2.2”) x Length 102.9mm (4.1”)
Weight 470g / 16.6oz
 

Sigma APO MACRO 150mm F2.8 EX DG HSM
Mount Type Four Thirds
Minimum Aperture F22
Lens Construction 16 Elements in 12 Groups
Angle of View 8.2°
Number of Diaphragm Blades 9pcs
Minimum Focusing Distance 38cm (15.0”)
Maximum Magnification 1:1
Filter Size 72mm
Lens Hood Bayonet type Hood
Dimensions Diameter 80.5mm (3.2”) x Length 142.4mm (5.6”)
Weight 920g / 32.4oz
 

Sigma APO 50-500mm F4-6.3 EX DG HSM
Mount Type Four Thirds
Minimum Aperture F22
Lens Construction 20 Elements in 16 Groups
Angle of View 24.4°-2.5°
Number of Diaphragm Blades 9pcs
Minimum Focusing Distance 100-300cm (39.37”-118.11”)
Maximum Magnification 1:5.2
Filter Size 86mm
Lens Hood Petal Hood
Dimensions Diameter 95mm (3.7”) x Length 223.9mm (8.8”)
Weight 1830g / 64.5oz
 

Original Source Press Release:

Sigma Corporation is pleased to announce the launch of new five lenses for Four Thirds System.

DC lenses : 30mm F1.4 EX DC HSM, 18-50mm F2.8 EX DC
DG lenses :MACRO 105mm F2.8 EX DG , APO MACRO 150mm F2.8 EX DG HSM
APO 50-500mm F4-6.3 EX DG HSM

Two DC lenses (18-50mm F2.8 EX DC and 30mm F1.4 EX DC HSM) and three DG lenses (MACRO 105mm F2.8 EX DG, APO MACRO 150mm F2.8 EX DG HSM and APO 50-500mm F4-6.3 EX DG HSM) are designed to maximize the potential of the digital imaging, and housed in a compact and lightweight construction. Our lens line-up for Four-Thirds mount is increased to total eight models with the introduction of these new lenses.

Large maximum aperture of F1.4, specifically designed for Four Thirds cameras.
30mm F1.4 EX DC HSM for Four Thirds Mount
This is the standard prime lens specifically designed for the digital cameras with large aperture F1.4. SLD (Special Low Dispersion) and ELD (Extraordinary Low Dispersion) glass elements are used to obtain the best possible correction for chromatic aberration of magnification, which is a critical problem for the digital imaging. From 40cm (15.75”) minimum focusing distance to infinity, this lens creates very sharp images with high contrast. The HSM (Hyper Sonic Motor) provides quiet high-speed auto-focus shooting, as well as full-time manual focus. Large maximum aperture of F1.4 can perform superbly in a great range of applications, including snapshots, portrait, and landscape photography.
* With Four-Thirds cameras, the angle of view will be equivalent to 60mm.

Compact-Lightweight large aperture zoom lens designed specifically for Four Thirds camera.
18-50mm F2.8 EX DC for Four Thirds Mount
F2.8 large aperture standard zoom lens designed specifically for Four Thirds system. This zoom lens is exclusively designed to ensure compact and lightweight construction as well as provides the utmost correction against lateral chromatic aberration, which is a critical problem for digital SLR cameras. This lens is specially coated to get the best color balance whilst cutting down flare and ghost caused by reflections from the digital image sensor. It has the best correction for vignetting and superior peripheral brightness is ensured.
*With Four-Thirds cameras, the angle of view will be equivalent to 36-100mm.

High performance medium telephoto macro lens optimized for Four Third cameras.
MACRO 105mm F2.8 EX DG for Four Thirds Mount
High contrast and excellent image quality are made possible in all shooting ranges. This macro lens maximizes the potential of Four-Thirds system. The power layout and multi layer lens coating reduce the influence of harmful light caused by reflections from the digital image sensor. A screw-in hood is included, for convenient use of circular polarizing filters.
* With Four-Thirds cameras, the angle of view will be equivalent to 210mm focal length.

Super compact and lightweight, large aperture telephoto lens with life-size macro capability for Four Thirds cameras.
APO MACRO 150mm F2.8 EX DG HSM for Four Thirds Mount
This large aperture telephoto macro lens enables you to shoot up to 1:1 life size close-up. This macro lens maximizes the potential of Four-Thirds mount system. This lens reduces the chromatic aberration of magnification, which is a critical problem for digital imaging. The best use of SLD (Special Low Dispersion) glass corrects the various color aberrations. Super multi coating reduces flare and ghost.
The HSM (Hyper Sonic Motor) system provides full-time manual focus.
* With Four-Thirds cameras, the angle of view will be equivalent to 300mm.

This telephoto zoom lens is capable of covering a wide range of focal lengths for Four Thirds cameras.
APO 50-500mm F4-6.3 EX DG HSM for Four Thirds Mount
This versatile 10x high zoom ratio lens designed specifically for the digital imaging and it covers the wide range of the focal lengths. This lens uses SLD (Special Low Dispersion) glass for correction of color aberration, and seven-group zoom system provides a high magnification throughout the entire zoom range. Super multi coating reduces flare and ghost. The HSM (Hyper Sonic Motor) system provides quiet high-speed auto-focus shooting, as well as full-time manual focus.
* With Four-Thirds cameras, the angle of view will be equivalent to 100-1000mm.

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