Sigma announces 18-50mm lens
By
Mike Tomkins
(Sunday, October 26, 2003 - 19:00 EST)
Alongside the launch of its new SD10 digital camera today, Sigma has announced a new 18-50mm lens.
To be available in Sigma, Canon, Nikon and Pentax lens mounts, the Sigma 18-50mm F3.5-5.6 DC is 67.5mm long, 60mm in diameter, weighs 245 grams and has eight elements in eight groups including aspheric elements. It uses a bayonet hood, has a filter thread of 58mm, and when used with the Sigma SD9 and SD10 digital cameras has an equivalent focal length of 30 - 85mm.
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Original Source Press Release:
| 18-50mm F3.5-5.6 DC Compact-Lightweight zoom lens designed to suit the characteristics of digital cameras. Sigma Corporation is pleased to announce the launch of the new 18-50mm F3.5-5.6 DC. This zoom lens was exclusively designed to suit the characteristics of digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras, and this produced a compact lens with a maximum diameter of 60mm (2.3”), overall length of 67.5mm (2.6”) and weight of only 245gr (8.6 ounces). It has a variable angle of view of 76.5°~31.7°. 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 lens has a minimum focusing distance of 25cm (9.8”) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.5. - An image sensor element larger than those corresponding to APS-C cannot be used in digital cameras or 35mm SLR cameras. If such an element is used vignetting will occur on the picture surface.
- If SD9 or SD10 digital cameras are used, the angle of view will be equal to 30-85mm focal length. The angle of view varies depending on the camera.
| THE SPECIFICATIONS | | Focal Length | 18-50mm | | Minimum Aperture | F22 | | Lens Construction | 8 Elements in 8 Groups | | Angle of View | 76.5°-31.7° | | Number of Diaphragm Blades | 7pcs | | Minimum Focusing Distance | 25cm (9.8”) | | Maximum Magnification | 1:3.5 | | Filter Size | 58mm | | Lens Hood | Bayonet Hood | | Dimensions | Diameter 67.5mm (2.6”) X Length 60mm (2.3”) | | Mounts (AF) | Sigma, Canon, Nikon (D), Pentax | | Weight | 245gr / 8.6 ounces | The appearance, specifications, and the like of the product are subject to change for improvement without notice. |
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