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Sigma DC lenses for Konica Minolta introduction
Mark Peters : January 21th 2005 - 08:20 CET
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SigmaSigma DC lenses for Konica Minolta introduction : Sigma DC lenses for Konica Minolta have been announced by Sigma. The announcement of the availability of four pieces of compact-lightweight DC lenses (18-50mm F2.8 EX DC, 18-50mm F3.5-5.6 DC, 18-125mm F3.5-5.6 DC, 55-200mmF4-5.6 DC) is good news for the new Konica Minolta digital SLR. The Sigma DC lenses are exclusively designed for digital SLR cameras. The image circle that DC lenses create is large enough to cover these smaller APS-C image sensors adequately. These DC lenses are especially designed and optimized to complement the characteristics of digital cameras. Compact dimensions and lightweight of these lenses offer superb handling and mobility.
Sigma DC lenses for Konica Minolta introductionSigma 18-50mm f2.8 - Compact
This Sigma DC lens offers a large aperture of F2.8 over its entire range of focal lengths and its large depth of field offers greater freedom of creative expression. This EX lens series lens is excellence of engineering and new technology. The use of two aspherical lens elements provides correction for various aberrations and makes high quality images a reality throughout the entire zoom range.

Sigma DC lenses specifications
- Lens construction: 15 Elements in 13 Groups.
- Angle of view 76.3°-31.6°.
- Number of diaphragm blades: 7pcs.
- Minimum aperture:F22.
- Minimum focusing distance: 28cm (11in.).
- Maximum magnification: 1?5.
- Filter size 67mm.
- Hood Type: Petal hood.
- Dimensions 74.1mm×83.6mm (2.9in.X 3.2in).
- Weight: 445g (15.7 oz.).

Sigma 18-50mm F3.5-5.6 DC lens - Features
Compact-Lightweight zoom lens has a maximum diameter of 62mm (2.4in.), overall length of 67.5mm (2.6in.) and weight of only 245gr 8.6 (oz.) and filter size of 58mm. Compact dimensions offers superb handling and mobility. The use of aspherical lenses provides correction for various aberrations throughout the entire zoom range and produce high level of optical performance. 18-50mm F3.5-5.6 DC zoom lens has a minimum focusing distance of 25cm (9.8in.) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.5.

Sigma 18-50mm F3.5-5.6 DC lens Specifications
- Lens construction: 8 Elements in 8 Groups.
- Angle of view 76.3°-31.6°.
- Number of diaphragm blades: 7pcs.
- Minimum aperture: F22.
- Minimum focusing distance: 25cm (9.8in.).
- Maximum magnification: 1?3.5.
- Filter Size: 58mm.
- Hood type: Bayonet Hood.
- Dimensions: 67.5mm X 62mm (2.6in. X 2.4in.)
- Weight 245g (8.6 oz.).

Sigma 18-125mm F3.5-5.6 DC lens - Exclusively designed
This zoom lens was exclusively designed for use with digital Single-Lens Reflex (SLR) cameras and has a 1:6.9 zoom ratio. From wide angle to telephoto, this new zoom lens can capture a wide range of subjects. As there is no need to change lenses, there is no risk of missing those great shots. A Special Low Dispersion (SLD) lens and two aspherical glass elements produce a high level of optical performance through the entire zoom range. We used the most appropriate coating for digital products to reduce flare and ghost, caused by digital SLR cameras and to produce the best color balance. This lens has a minimum focusing distance of 50cm (19.6in.) at all focal lengths and a maximum magnification of 1:5.3. The lens is equipped with an inner focusing system, which prevents the front element from rotating making it particularly suitable for Petal shaped hoods and a circular polarizing filters. The lens is also equipped with a zoom lock that eliminates "zoom creep" during transit.

Sigma 18-125mm F3.5-5.6 DC lens specifications
- Lens construction: 15 Elements in 14 Groups.
- Angle of view: 76.3°-12.9°.
- Number of diaphragm blades: 7pcs.
- Minimum aperture: F22.
- Minimum Focusing Distance: 50cm (19.6in.).
- Maximum magnification 1?5.3.
- Filter Size 62mm.
- Hood type: Petal Hood.
- Dimensions 70mm×77.2mm (2.7in. X 3in.).
- Weight 380g (13.4 oz.).

Sigma 55-200mm F4–5.6 DC lens - Compact telephoto zoom
This compact telephoto zoom lens was exclusively designed for use with digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras that also allows compact body and lightweight a maximum diameter of 70 mm (2.7in.), and overall length of 86.6mm (3.4in.), and weight of only 310g/10.9 ounces. It has a filter size of 55mm. Characteristics of digital cameras were taken into consideration when designing the lens power layout, making high-quality images reality through the entire zoom range. This lens has a minimum focusing distance of 110cm (43.3in.) and maximum magnification of 1:4.5.

Sigma 55-200mm F4–5.6 DC lens specifications
- Lens construction: 12 Elements in 9 Groups.
- Angle of view: 28.8°- 8.1°.
- Number of Diaphragm Blades: 8pcs.
- Minimum Aperture: F22.
- Minimum Focusing Distance: 110cm (43.3in.).
- Maximum Magnification: 1?4.5.
- Filter Size 55mm.
- Lens Hood: Bayonet Type.
- Dimensions 70mm×86.6mm (2.7in.X3.4in.).
- Weight 310g (10.9 oz.).

Sigma DC lenses - Characteristics
The characteristics of digital SLR cameras were taken into consideration when designing the lens power layout, especially for effective compensation of lateral chromatic aberration, which is likely to occur with digital SLR cameras. Most Appropriate Coating for Digital Products, Super Multi Layer (SML) coating gives the best color balance and reduces flare and ghosting from which digital cameras tend to suffer. This lens has excellent correction for vignetting which is a common problem of large aperture lenses. Its new design ensures superior peripheral brightness.

   Sigma DC lenses introduction | Photokina 2004
   Sigma 18-50mm F2.8 EX DC lens introduction
   Sigma macro 50mm F2.8 EX DG lens introduction
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