Sigma 17 70mm f 2 8 4 5 DC IF Macro Lens for Canon Digital SLR Cameras
September 6, 2008 by admin · Leave a Comment
Sigma 17 70mm f 2 8 4 5 DC IF Macro Lens for Canon Digital SLR Cameras
It can be used with wide variety of subjects and it is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor.This lens has a minimum focusing distance of 7.9″ (20cm) throughout the entire zoom range. Maximum magnification of 1:2.3 enables close-up photography like a macro lens. This lens design and multi layer lens coating reduce flare and ghosting, which is a common problem with digital cameras. A Special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range.This lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 82.5mm (3.2″) and diameter 79mm (3.1″). It performs superbly even in relatively low light conditions indoors or at dusk.The lens design incorporates an inner focusing system, which ensures fast AF speed as well as prevents the front of the lens rotating, making it particularly suitable for use with circular polarizing filters and petal shaped lens hoods. This lens is also equipped with Zoom Lock Switch that eliminates ‘Zoom Creep’ during transportation.
Sigma 18 200mm f 3 5 6 3 DC Lens for Nikon Digital SLR Cameras
September 2, 2008 by admin · Leave a Comment
Sigma 18 200mm f 3 5 6 3 DC Lens for Nikon Digital SLR Cameras
This high zoom ratio lens is exclusively designed for digital SLR cameras and capable of covering a wide range of focal lengths from wide-angle to telephoto. Two Special Low Dispersion (SLD) glass elements and two hybrid aspherical lenses offer the utmost correction for all types of aberrations, and enables this extended range super zoom lens to be housed in a compact and lightweight construction of 70mm (2.8″) diameter, and 78.1mm (3.1″) in length, and weighing just 405g/14.3oz. The new lens coating reduces flare and ghost, which is a common problem of digital cameras and also creates an optimum color balance. This lens has a minimum focusing distance of 45cm (17.7″) at all focal lengths and has maximum magnification of 1:4.4.The lens design incorporates an inner focusing system, which prevents the front of the lens from rotating, making it particularly suitable for using circular polarizing filters and petal shaped lens hoods. The overall length of the lens does not change during focusing, ensuring convenient handling and ease of use. A zoom lock switch eliminates ‘zoom creep’ during transportation, a convenient addition when traveling.
