Olympus Zuiko 7 14mm f 4 0 Aspherical Super ED Lens for Olympus Digital SLR Cameras
September 22, 2008 by admin · Leave a Comment
Olympus Zuiko 7 14mm f 4 0 Aspherical Super ED Lens for Olympus Digital SLR Cameras
The Zuiko Digital ED 7-14mm F4.0 2x Super-Wide-Angle Zoom Lens was developed for use with the Olympus E-System digital SLR camera system, which complies with the Four Thirds System, an industry standard for Designed for Digital interchangeable lenses. This super-wide-angle lens offers professional-class specifications, including 2x zoom capacity from a wide-angle focal length of 7mm, and protection against dust and water droplets. The advantages of a super-wide-angle lens include its ability to emphasize perspective and enhance depth of field. To use this perspective effect fully, it is necessary to shoot from a position as close the subject as possible. This lens has a minimum working distance of 10cm, allowing the photographer to explore the unique expressive possibilities of close-up wide-angle photography. The lens incorporates two molded glass aspherical lens elements for effective correction of the distortion and astigmatism commonly associated with super-wide-angle lenses. Distortion is minimal, even when shooting close to the subject, allowing the lens to produce sharp images. Olympus has multi-coating process to minimize reflections across a wide range of wavelengths. This feature minimizes the ghosting and flaring that commonly affect wide-angle lenses.
Sigma 24 60mm f 2 8 EX DG IF Aspherical Wide Angle Zoom Lens for Nikon SLR Cameras
August 21, 2008 by admin · Leave a Comment
Sigma 24 60mm f 2 8 EX DG IF Aspherical Wide Angle Zoom Lens for Nikon SLR Cameras
The effective arrangement of Special Low Dispersion (SLD) and aspherical glass elements has created a lens of compact dimensions. With an overall length of 84.7mm (3.3in.), it is the smallest lens of this focal range. This lens offers a large aperture of F 2.8 over its entire range of focal lengths, which is ideal for low light situations both indoors and out. It has a large depth of field that offers the photographer greater freedom of expression.By using a new technology and optical design, this lens satisfies the needs of digital photography. Two Special Low Dispersion (SLD) glass elements are provided for effective compensation of color aberration, which is a common problem with wide-angle lenses. Four aspherical lenses, one molded glass type and three hybrid aspherical types, offer excellent correction for distortion as well as all types of aberration. The design concept of this lens is especially suitable for the characteristics of Digital SLR Cameras. New coating reduces flare and ghost, which is a common problem of digital cameras and also creates an optimum color balance. This lens has excellent correction for “light-fall-off”, which is a common problem of large aperture lenses.The design ensures sufficient illumination of the corners of the image.It is capable of taking pictures with a minimum focusing distance of 38cm (15.0in) at all focal lengths. It is very effective for close-up photography. The high performance inner focus system is particularly suitable for using circular polarizing filters and a petal-type hood as the front of the lens does not rotate.This lens is also equipped with a zoom lock that eliminates “Zoom Creep”. This remarkably compact, high performance zoom lens is ideally suited for traveling.
