!88: Search Digital Camera Ideas: January 2012

Monday, January 23, 2012

Tamron AF 10-24mm f/3.5-4.5 SP Di II LD Aspherical (IF) Lens for Sony Minolta AF Digital SLR Cameras

!±8± Tamron AF 10-24mm f/3.5-4.5 SP Di II LD Aspherical (IF) Lens for Sony Minolta AF Digital SLR Cameras

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| Price : $459.95 | Post Date : Jan 23, 2012 08:48:05
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The SP AF10-24mm F/3.5-4.5 Di II LD Aspherical (IF) is an advanced ultra wide-angle zoom lens that is versatile and offers even higher performance and specifications than the current Tamron SP AF11-18mm F/4.5-5.6 zoom lens. The lens covers an extended focal length range that is particularly wide for an ultra wide-angle zoom lens, while improving the aperture to F/3.5-4.5 and keeping the filter diameter to 77mm. Its lightweight and compact size makes this new wide-angle zoom very user friendly. The lens was designed for use with digital SLR cameras and thereby employs special optical glass materials for outstanding optical performance such as large-aperture glass-molded aspherical elements and hybrid aspherical elements. FEATURES: Compact Ultra Wide-angle Zoom Lens Covering a Broad Range from 10mm to 24mm - The Tamron zoom covers a focal length range equivalent to 16-37mm* when converted to a 35mm full-size format. Its ultra-wide zoom ratio of more than 2X provides a versatile variety of angles of view, thus improving photographic creativity. Features an Optical Design Optimized for Digital Camera Characteristics Ensures High Optical Performance - 1. Employment of Special Optical Glass Materials Provides High Performance The new zoom lens uses an HID glass element and a pair of LD glass elements to minimize on-axis and lateral chromatic aberrations that are the greatest hindrance to high optical quality. To further achieve outstanding optical quality, the lens uses a high quality, glass-molded aspherical element and three hybrid aspherical elements to thoroughly compensate for spherical and comatic aberrations and distortion. 2. Optical Design Optimizes the Angles of Incidences of Light Rays Reaching the Imager The ultra wide zoom lens uses a new optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field from the center to the periphery, by consi

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Thursday, January 19, 2012

Slr Camera Digital Lenses - Glass Or Plastic?

!±8± Slr Camera Digital Lenses - Glass Or Plastic?

Slr Camera Digital Lenses can be made of glass or plastics. So why does it matter whether way? They are complicated pieces of tool and light is particularly sensitive to how it is treated. Furthermore, camera lenses can be made of manifold elements that all work together to furnish the desired zoom. This all adds to the complexity and therefore amplifies limited differences in optical quality etc.

Some higher end complicated lenses may have 20 or more elements. These are most generally made of glass, generally due to its classic optical properties and also because if its relatively good resistance to scratching. Some other materials like Quartz glass, fluorite and assorted forms of plastic are also used.

Plastics are often used because they allow the organize of extremely aspherical lens elements which are almost impossible to generate using glass. Plastics in can facilitate an improved lens organize process and improve the general performance quality of the camera too. While plastic is often used on inner elements, they are only used on the outermost elements of all but the cheapest lenses as they scratch easily.

An indication of their utility is that molded plastic lenses are used in the organize of the cheapest throw-away disposable cameras. Manufacturers of quality optics tend to use substitutes such as "optical resin". While it is true that glass provides for higher quality performance than plastic, many contemporary and high performance lenses from big brand labels include some molded or hybrid aspherical elements.

So if you are deciding on which to go with, glass is pretty much an indication of higher quality relative to plastic. Its properties naturally treat light good and furnish a truer picture.