Sigma today announced two new lenses designed specifically for digital SLR APS sensor size. The 18 - 50 mm F3.5 - 5.6 DC and 55 - 200 mm F4.5 - 5.6 DC lens can be made considerably smaller and lighter because they are designed to produce an image circle specifically large enough for an APS size sensor (all current digital SLRs except the Canon EOS-1D/1Ds and Kodak DCS-14n). Both lenses are notably lighter and more compact than 35 mm equivalents. Used on the Sigma SD9 or SD10 these new lenses would provide an equivalent field of view of 30 - 85 mm and 93 - 340 mm respectively.

Press Release:

Sigma 18-50mm F3.5-5.6 DC

Compact-Lightweight zoom lens designed to suit the characteristics of digital SLR 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 245g (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.

Sigma 18-50mm F3.5-5.6 DC Specifications

Focal length 18 - 50 mm
Minimum aperture F22
Maximum aperture F3.5 - F5.6
Construction 8 elements in 8 groups
Angle of View 76.5° - 31.7°
Number of Diaphragm Blades 7 pieces
Minimum Focus Distance 25 cm (9.8 in)
Maximum Magnification 1:3.5
Filter size 58 mm
Lens hood Bayonet Hood
Dimensions (dia x len) 67.5 (2.6 in) x 60 mm (2.3 in)
Mounts (AF) Sigma, Canon, Nikon (D), Pentax
Weight 245 g (8.6 oz)

Press Release:

Sigma 55-200mm F4-5.6 DC

High-performance Telephoto Zoom Lens, designed for use with digital SLR cameras

Sigma Corporation is pleased to announce the launch of the new 55-200mm F4-5.6 DC. 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 with overall length of 84.6mm (3.3"), and weight of only 310g/10.9 ounces. It has a filter size of 55mm, maximum diameter of 70mm (2.7"). This remarkably compact high performance zoom lens is ideally suited to a wide range of subjects. This lens has a minimum focusing distance of 110cm (43.3") and maximum magnification of 1:4.

* 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, angle of will be equal to 93-340mm focal length. The angle of view varies depending on the camera.

Sigma 55-200mm F4-5.6 DC Specifications

Focal length 55 - 200 mm
Minimum aperture F22
Maximum aperture F3.5 - F5.6
Construction 10 elements in 9groups
Angle of View 29.0° - 8.1°
Number of Diaphragm Blades 8 pieces
Minimum Focus Distance 110 cm (43.3 in)
Maximum Magnification 1:4.5
Filter size 55 mm
Lens hood Bayonet Hood
Dimensions (dia x len) 70 (2.7 in) x 84.6 mm (3.3 in)
Mounts (AF) Sigma, Canon, Nikon (D), Pentax
Weight 310 g (10.9 oz)