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SIGMA
Designed for use with autofocus and multifocus SLR cameras, the Sigma 52mm circular polarizing filter cuts the glare from water and nonmetallic surfaces, letting you enjoy crisper, clearer images. A circular polarizer is intended to improve color saturation and contrast, performing such tasks as darkening the sky in color photography without affecting the color balance. The filter's multilayer coating, meanwhile, optimizes protection for the lens while further reducing reflection. The filter--which is designed to especially benefit wide-angle lenses without vignetting--fits lenses with 58mm filter threads. Note that the polarizing filter does not have a thread on the front filter ring.
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SIGMA
The Sigma 20mm f/1.8 D EX DG Aspherical Lens has a clutch-like system for switch between AF and MF modes. The system is very similar to the Sigma 105mm f/2.8 EX macro lens I reviewed previously. You push the manual focus ring forward to disengage the focus ring for auto-focusing. For manual focusing, you pull it toward you to engage the clutch. When the ring is set to AF, you can rotate the focusing ring all you want, you won't change the focus on the lens. When the lens is auto-focusing, it also doesn't effect the position of the manual-focusing ring. The manual focus ring is wide so there is no chance that you'll miss it in operation.
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SIGMA
This high-quality Sigma UV Filter blocks the invisible UV component of light from the sky, which can cause blur and to which many color films react with a blue cast. UV Filters are ideal for photography in high altitudes (in the mountains), by the sea and in regions with very clean air. The pictures gain brilliance and disturbing blue casts are avoided. Because the glass is colorless, color rendition is not altered, aside from the elimination of the unwanted blue cast, and no increase in exposure is required. The colorless glass also makes a UV Filter very suitable as protection for the front element of your lens against dust, flying sand, sea water spray and the like, and it can be kept on the lens at all times. It is recommended for color and black & white film, as well as digital photography. Multi-Layer Coating for Superior Protection: Sigma has treated this filter with a multi-layer coating process, which, in addition to its UV-blocking qualities, makes these filters especially scratch-resistant. This coating does not affect the optic characteristics of the filter, but significantly optimizes the protective effects.
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SIGMA
This autofocus fisheye lens is designed for use with digital SLR cameras equipped with APS-C size image sensors. The Nikon version produces a diagonal angle of view of 180� (154�for Sigma, 167� for Canon). The diagonal field of view of this fisheye lens produces striking images with exaggerated perspective and distortion. The minimum focusing distance of 13.5cm/5.3inch, and maximum magnification 1:3.3 allows subjects to be as close as 1.8cm/0.7inch from the lens' front element. This close focusing capability allows close-up photography and also it is possible to make use of large depth of field that covers wide range of subjects. The Integral hood blocks out extraneous light and the Super Multi-Layer Coating minimizes flare and ghosting, creating superior image quality. The HSM (Hyper Sonic Motor) ensures fast and quiet autofocusing and allows full-time manual focus override by rotation of the focus ring. This lens is supplied with a gelatin filter holder at the rear, allowing the use of gelatin filters.
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SIGMA
This high-quality Sigma UV Filter blocks the invisible UV component of light from the sky, which can cause blur and to which many color films react with a blue cast. UV Filters are ideal for photography in high altitudes (in the mountains), by the sea and in regions with very clean air. The pictures gain brilliance and disturbing blue casts are avoided. Because the glass is colorless, color rendition is not altered, aside from the elimination of the unwanted blue cast, and no increase in exposure is required. The colorless glass also makes a UV Filter very suitable as protection for the front element of your lens against dust, flying sand, sea water spray and the like, and it can be kept on the lens at all times. It is recommended for color and black & white film, as well as digital photography. Multi-Layer Coating for Superior Protection: Sigma has treated this filter with a multi-layer coating process, which, in addition to its UV-blocking qualities, makes these filters especially scratch-resistant. This coating does not affect the optic characteristics of the filter, but significantly optimizes the protective effects.
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SIGMA
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SIGMA
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SIGMA
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SIGMA
The Sigma 28-300mm f3.5-6.3 Macro lens covers all the focal lengths from 28mm wide angle to 300mm telephoto with 10.7:1 high zoom ratio as well as macro capability. The 28-300mm f3.5-6.3 Macro packs a lot of performance in a compact package with ultra-compact dimensions that make this lens the ultimate traveling companion length. Two-piece Special Low Dispersion (SLD) glass elements and four-piece Aspherical Lenses, produce a high level of optical performance. The 28-300mm f3.5-6.3 Macro lens feature two-piece Special Low Dispersion SLD glass elements and four-piece aspherical lenses, to produce a high level of optical performance. Aspherical lenses provide excellent correction for all types of aberration while making a very compact construction possible. Macro photography with a 1:3 maximum photography ratio The 28-300mm f3.5-6.3 Macro lens has a minimum focusing distance of 19.7 inches (50 centimeters) at all focal lengths and is equipped with a macro mechanism for close-up photography at 300-millimeter telephoto, with a reproduction ratio of 1:3. Inner Focus System This design allows for stability and compactness in design as changes in focus are made in an internal lens grouping. This also gives the advantage of a non rotating front lens assembly which is of great benefit when using polarizing filter and petal-type hood. The "Zoom Lock" device prevents the zoom setting from being changed inadvertently. The 28-300mm f3.5-6.3 Macro lens is equipped with a zoom lock to prevent the lens from creeping due to its own weight, and to offer protection whilst the lens is being carried. DG Lens These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.
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SIGMA
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SIGMA
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SIGMA
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SIGMA
The large aperture wide-angle lens for close up photography. This large-aperture wide-angle lens is equipped macro focusing capability with a maximum magnification of 1:2.7 and fast F1.8 maximum aperture. The use of aspherical lenses are offered for superior peripheral brightness and compensation of aberrations and astigmatism. This is an ideal DG lens for Digital SLR cameras. Macro capability This lens is capable of Macro photography at minimum focusing down to 18cm (7.1 inch) (reproduction ratio 1:2.7). It incorporates the floating focus system in order to minimize distortion, spherical aberration and astigmatism, which provide high performance at all shooting distance down to 18 cm (7.1 inch). Reproduction ratio 1:2.7 and an angle of view of 84.1allow capturing of high quality images not only a subject but also the surrounding scenery. Large front element and Super wide-angle This lens has an advanced optical construction, in order to obtain adequate peripheral brightness at open aperture. Also, the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. Handling This lens also incorporates a Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. Also this allows the use of a Petal-type Hood , which is superior light blocking effect. Aspherical lens It incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion, spherical aberration and astigmatism. Specifications: Lens Construction 10 Elements in 9 Groups Angle of View 84.1 degrees Number of Diaphragm Blades 9 Blades Minimum Aperture F22 Minimum Focusing Distance 18cm/7.1 in. Maximum Magnification 1:2.7 Filter Size Diameter 77mm Dimensions Diameter 83.6mm X Length 82.5mm Weight 485g
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SIGMA
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.
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SIGMA
This high-quality Sigma UV Filter blocks the invisible UV component of light from the sky, which can cause blur and to which many color films react with a blue cast. UV Filters are ideal for photography in high altitudes (in the mountains), by the sea and in regions with very clean air. The pictures gain brilliance and disturbing blue casts are avoided. Because the glass is colorless, color rendition is not altered, aside from the elimination of the unwanted blue cast, and no increase in exposure is required. The colorless glass also makes a UV Filter very suitable as protection for the front element of your lens against dust, flying sand, sea water spray and the like, and it can be kept on the lens at all times. It is recommended for color and black & white film, as well as digital photography. Sigma has treated this filter with a multi-layer coating process, which, in addition to its UV-blocking qualities, makes these filters especially scratch-resistant. This coating does not affect the optic characteristics of the filter, but significantly optimizes the protective effects.
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Sigma Corporation
This circular fisheye lens produces circular images with an angle of view of 180 degrees when attached to a full-frame digital or 35mm film SLR camera. It has a maximum aperture of F3.5, a minimum focusing distance of 13.5cm (5.5) and a maximum magnification of 1:4.6. The special fisheye design allows maximum creative expression. Sigma's super multi-layer lens coating reduces flare and ghosting, a common problem with digital cameras. The new lens power layout reduces color aberrations, providing excellent image quality for digital and film SLR cameras. This lens can be used for the scientific applications such as the solid angle measurements of cloud distribution over the sky, the vegetation distribution of the rain forest canopy, etc., due to the quantifiable angle/area relationship it produces. This lens has a gelatin filter holder at the rear, allowing the use of gelatin filters. Specifications: Focal Length: 8mmMinimum Aperture: F22Lens Construction: 11 Elements in 6 GroupsAngle of View: 180 degreesNumber of Diaphragm Blades: 6pcsMinimum Focusing Distance: 13.5cm(5.3)Maximum Magnification: 1:4.6Filter Size: Gelatin FilterLens Hood: Petal HoodDimensions: Diameter 73.5mm (2.9)X Length 68.6mm (2.7)Weight: 400g /14.1oz
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SIGMA
Digitally Optimised (DG) Filters EX DG filters benefit from Sigma's multi-layer lens coating, developed to counteract the highly reflective characteristic of image sensors. With older style filters, light would reflect off the image sensor, bounce off the lens and filter elements and re-enter the image sensor, creating a ghost image. The multi-layer coating dramatically reduces this effect. In addition to this, an optimum, neutral colour balance is ensured, increasing the white balance accuracy of the digital camera. Multi-coated UV Filter This filter perfectly eliminates the harmful effect of ultraviolet light. The multi-coated UV filter can be used with both colour and black-and-white film anddigital sensors. This is the most suitable filter for protective use and generalphotography.
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SIGMA
This large aperture wide-angle lens can be used for both digital and 35mm film SLR cameras. It has macro focusing capability with a fast F1.8 maximum aperture, which is ideal for Digital SLR cameras. With a minimum shooting distance of 7.8 , reproduction ratio of 1:2.9 and a 75.4 degree angle of view, you can not only take pictures of the subject but also the surrounding scenery. Also, the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. Sigma s advanced optical construction utilizes a floating focus system and two aspherical lens elements for superior peripheral brightness and compensation of aberrations and astigmatism. Super Multi Coating reduces flare and ghosting that tends to occur when using digital SLR cameras. The Dual-Focus (DF) mechanism eliminates the need for the front of the lens to rotate during auto-focus. The wide, textured, rubberized focus ring conveniently moves forward to click into AF position and back to select manual focusing. Also, this also allows the use of a Petal-type Hood and the easy use of a polarizing filter.
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SIGMA
One of the favorite lenses among news photographers, a 70-200mm f/2.8 or 80-200mm f/2.8 zoom also appeals to many serious photo enthusiasts. Although large and heavy, lenses of this type offer several benefits. Their very wide maximum aperture allows for faster shutter speeds than the more typical f/4.5-5.6 zooms, great for low-light or action photography at lower ISOs (film or digital) for images with less grain or noise.
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SIGMA
The AF 28-300mm F3.5-6.3 MACRO lens covers all the focal lengths from 28mm wide angle to 300mm telephoto with 10.7:1 high zoom ratio as well as macro capability. This lens packs a lot of performance in a compact package with ultra compact dimensions (Diameter 74mm and Length of 86mm) that make it the ultimate traveling companion. Its the ideal lens all types of photography and optimized for digital SLR cameras. The new multi layer lens coating and lens design reduce flare and ghost. SLD Glass elements and Aspherical Lenses in both front and rear lens groups provide excellent correction for all types of aberrations and distortion. The 28-300mm F3.5-6.3 DG MACRO lens has a minimum focusing distance of 19.7 at all focal lengths and is equipped with a macro mechanism for close-up photography at 300mm telephoto, allowing a reproduction ratio of 1:3. An Inner Focusing System is designed to allow for stability and compactness in design as changes in focus are made in an internal lens grouping. This also gives the advantage of a non-rotating front lens assembly, which is ideal for using a circular polarizing filter and Petal-type hood. The lens is equipped with a zoom lock to prevent the lens from zoom creep due to its own weight.