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Sigma 14 mm f2.8 EX Aspherical til Sony og Minolta Solgt 13 år sedan På salg i 20 dager |
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Knallbra Linse!!! Selges kun pga. overgang til et annet merke...Kan brukes til Sony og MinoltaSigma AF 14mm f/2.8 EX Aspherical HSM By Peter K. BurianThis Sigma 14mm lens came in handy whenever my 20mm was too long to include all important areas of a subject or scene. Extremely short focal lengths are often useful problem-solving tools. (Nikon N90s; Bogen tripod; f/22; Ektachrome E100VS.)Until recently, most photographers considered a 19mm or 20mm focal length as the ultimate in ultra-wide, but this is rapidly changing. Thanks to the new technologies for making more affordable aspherical elements, much shorter lenses are becoming readily available. The first independent brand manufacturer to release a 14mm lens of this type, Sigma incorporated a bonus in their model: an ultrasonic focus motor. More importantly perhaps, they offer premium-grade optics for excellent image quality as I discovered during my tests while shooting stock in San Diego and Toronto.Primary Features. Do note that the Sigma AF 14mm f/2.8 EX Aspherical HSM is not a fisheye, but a true rectilinear lens. Barrel distortion is well corrected, so straight lines even at the edges of the frame are accurately rendered. Before moving on to consider optical performance in more detail however, lets review the technical details of this lens, as follows. It incorporates the fast/silent Hypersonic Focusing system, described later, in models intended for Canon, Nikon (D), and Sigma autofocus SLRs. Nikon owners should note that AF operates only with the more recent cameras: F5, F100, N90 series, N70, N60, and the Pronea series. Manual focus is possible even in the AF mode. After the lens stops autofocusing, you can touch up focus by turning the ring, while maintaining slight pressure on the cameras shutter release button. Models designed for Minolta and Pentax cameras incorporate a conventional focus motor. These do require you to switch to MF for any manual focus operation. The maximum aperture of f/2.8 is very wide, making this lens useful for photojournalism in low-light situations. I was able to get sharp pictures handheld inside Spanish missions at 1/15 sec (and even longer with my elbows braced), important because flash is not practical with such short focal lengths. Thats because very few flash units (even with accessories) can cover the 114° field of view, making such lenses more likely to be used with available light only. As hinted earlier, the optical formula includes aspherical--with a non-spherical surface--elements to correct aberrations. This type causes all light rays to converge on a common plane. Such elements offer several benefits: they correct linear distortion and spherical aberration (curvature of field) for more consistent edge to edge sharpness even at wide apertures; reduce halo and comatic flare; and minimize size/weight as fewer elements are required. In order to reduce the risk of flare (from light striking the front element) Sigma has included a built-in notched lens hood: cut out at the corners to prevent vignetting of the image area. In order to mount a lens cap, you do need to add an adapter ring because the cap will not fit over the bulging optics without one. This is common in other brands of super wide lenses, too. But remember to remove this circular adapter before taking any pictures. If you fail to do so, all of your photos will have severe darkening of all corners. Because filters cannot be mounted on the front of 14mm lenses, there is a built-in gelatin filter holder at the rear. Simply cut the right size using the guide plate accessory and insert the small filter in the slot provided behind the rear optical element. (Gelatin filters are available from professional photo retailers.) Mechanically and cosmetically, this is clearly a high grade lens, as suggested by the EX designation, used only for Sigmas latest pro-caliber lenses. The barrel is made of aluminum alloy, the mount is stainless steel, and the matte-black ZEN finish offers a professional look plus scratch-resistance. Youll find a distance scale (feet and meters) under glass as well as a depth of field scale. Models intended for some brands of cameras include an AF/MF switch and an aperture ring for setting f/stops with detents at full stops. The wide, rubberized manual focus ring is well damped, with plenty of friction for a familiar feel. The close-focusing ability is highly desirable for maximizing depth of field, when shooting at the smallest apertures, as discussed later.I found the Sigma 14mm lens ideal whenever I wanted to include a great deal of the environment to ensure a sense of place in travel photography. (Nikon N90s; f/5.6; Fujichrome Velvia.)Optical Evaluation. Considering the incredibly wide field of view, a 14mm lens is not exactly an all-purpose piece of equipment, but it came in handy for photographing the expansive Mission San Luis Rey, the museums of Balboa Park, and the extravagantly beautiful grounds and buildings of the Hotel Del Coronado across the bridge from San Diego. It would also be a great choice for grand landscapes or in cramped interiors where you want to include as much of the subject as possible, without switching to a fisheye lens.When reviewing my slides under a 10x loupe on a light table, I made the following notes: Linear distortion is indeed extremely well corrected. As long as I held the camera perfectly level--with the film plane parallel to the subject--all lines were rendered as straight and true. As with any ultra-wide lens, there is some limited barrel distortion, but this is surprisingly well controlled. As with any wide angle lens, tilting the camera upward produces unusual effects, highly useful in interpretive (non-documentary) photography. Light falloff is minimal even at wide apertures and completely gone by f/5.6. Since most of my outdoor work was at f/16, there is absolutely no darkening of the corners of my images in the vast majority of the slides.When using the Sigma 14mm lens, I often took advantage of its characteristics for interpretive images, instead of shooting documentary records of architecture. Note the very high sharpness and definition of intricate detail across the entire frame. (Nikon N90s; f/16; Fujichrome Velvia.) At every aperture from f/5.6-f/16, this lens produced images suitable for excellent 16x24 prints with high edge to edge sharpness. The slides also exhibit very good contrast, great clarity, and impressive definition of intricate detail. Even at the widest and smallest apertures, image quality is adequate for beautiful 11x14 prints or double page spreads in magazines or books. Effective Techniques. Making successful images with a 14mm lens does take some practice, considering the unusual characteristics of such optics. Consider the following to maximize the visual impact and technical quality of your photographs. Unless you tilt the lens upward, youll get a vast amount of empty space in the foreground when photographing buildings. Move in close when possible or exaggerate the leaning over backward effect so the viewer is clearly aware of your intentions. The expanded spatial perspective is far more noticeable than with a 20mm lens, creating great apparent distortion of the relative size of objects within a scene. Nearby objects become unusually prominent, overpowering the scene, at an apparent size far beyond the norm. Meanwhile, anything at a greater distance is pushed back, rendered much smaller than the eye perceives and receding into the distance. Take advantage of this characteristic, including subject matter in the immediate foreground, the mid-ground, and the background for a sense of depth, or a three-dimensional feel in a two-dimensional photograph. Exploit the benefits of expanded depth of field as well, to render all subjects from foreground to infinity within the zone of apparent sharp focus. A hillside of wildflowers, for instance--with an expansive sweep of blossoms as far as the eye can see--makes for an appealing picture. Set focus for the hyperfocal distance to maximize depth of field at any aperture. At f/8 focus at 3.2; at f/11 focus to 2.4; at f/16 focus to 1.2; and at f/22 focus at 1.2. Use these recommendations, and virtually everything in the photograph will appear sharply rendered. (The depth of field extends from one-half the focused distance to infinity with this technique.) Compose carefully. The extremely wide angle of view can include numerous subject elements that will compete for viewer attention. Strive to create images with a clear message or sense of purpose. Move in closer to eliminate extraneous details. Flare is well controlled, but take care in backlighting, as with any 14mm lens. Because the optics protrude and the hood can provide only minimal shading, avoid situations where the sun is in the frame. Try to shade the lens with your hand, the branch of a tree, or with a Flare Buster, an adjustable accessory that can be positioned exactly where required (from Gran View Inc., (888)or www.granview.com) Compensate for underexposure, which is likely with any super wide lens where a lot of bright sky, water, sand, or snow is included in the frame. As a starting point, dial in a +1 stop compensation factor in Automatic, or open up in Manual mode, and bracket exposures if using slide film.Conclusion. Aside from its problem-solving abilities, a 14mm lens should be considered for creating special effects impossible with longer focal lengths. Some of your pictures will seem distorted but others will be dynamic or dramatic. If you want to expand your horizons and are willing to experiment, this Sigma lens can open new doors to creativity. Though not inexpensive, it is relatively affordable for the focal length and will reward the investment with professional-caliber image quality.With an angle of view of 114°, it can be difficult to compose without including a vast expanse of foreground in architectural photography. A slight upward tilt can help, at the risk of some linear distortion. (Nikon N90s; Bogen tripod; f/16; Ektachrome E100SW.)Hypersonic FocusingSigma now offers the Hypersonic focus technology in several lenses, including this 14mm f/2.8 EX Aspherical HSM model, in Canon, Nikon (D), and Sigma AF mount. The ultrasonic motor employs vibrational energy unlike conventional DC motors which convert electromagnetic force into rotational force. In HSM motors, friction between a stator and a rotor creates oscillation energy (flexural progressive wave) to generate rotational force. Several benefits are claimed: nearly silent operation, better starting/stopping response, longer motor life, and the ability to override AF without switching over to Manual focus.Is AF necessary with a 14mm lens where depth of field is so extensive as to mask any manual focusing error? In my opinion it is, if you want precise focus on the primary subject area in serious photography. This is more easily accomplished with autofocus than by eye, with ultra-wide lenses. Aside from architecture and cityscapes, I also tested the Hypersonic system with skaters on an outdoor ice rink, both approaching and pulling away from my position, in continuous/predictive follow focus. The camera used for my tests was a Nikon N90s. I made the following assessments: Autofocus was precise and highly accurate with stationary subjects such as the incredible architecture of Balboa Park. Because of the wide f/2.8 maximum aperture, focus acquisition was excellent even in low light. (The wide aperture transmits plenty of light to the AF sensors assuring quicker focus acquisition.) When tracking skaters, all frames in series of six were razor sharp. Continuous autofocus performance was excellent even with erratic motion. In summary, the Sigma Hypersonic focusing system is indeed very successful. It will meet the expectations of most serious photographers. Note: The parts and technology employed in the Sigma Hypersonic system are not the same as in Canons Ultrasonic system. In fact, HSM contains many components exclusive to Sigma.Technical SpecificationsLens Construction: 14 elements in 10 groups Angle Of View: 114.2° Maximum/Minimum Aperture: f/2.8 and f/Minimum Focusing Distance: 7.1 (0.18 meters) Maximum Magnification: 1:5.Filter Size: N/A; rear mounted gel only Lens Hood: Built-in Dimensions: 3.15x3.6 (80x91mm) Weight: 23.1 oz (655g) Available Mounts: Sigma AF (HSM), Canon EF (HSM), Nikon AF/D (HSM); Pentax AF and Minolta AF (conventional focus motor) |
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ACER Ultra Aspire ONE Travelmate 9 Hurry sold out fa... 2 400 ,- Solgt 13 år sedan På salg i 414 dager |
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| Acer Aspire One TravelmateULTRA PORTABLE LAPTOP - 2.5lb ! FACTORY SEALED!Microsoft WINDOWS XP w/ SP3 installed Intel® Atom Processor N 8.9" WSVGA Acer CrystalBrite TFT LCD (1024 x 600) Multi-in-1 Digital Media Card Reader Acer InviLink 802.11b/g Wi-Fi CERTIFIED Integrated Acer Crystal Eye Webcam Dimensions 9.8 (W) x 6.7 (D) x 1.42 (H) inches (2.44lbs) GB RAM GB SSD by ACER. Comes with ACER Warranty!ProcessorThe Intel Atom processor uses a brand new design structure that packs in 47 million transistors into a single chip sized at just 22mm (0.87 inches), and it uses just 2.5 watts of power--less than 1/10 of the 35 watts used by an Intel Core 2 Duo processor--for excellent battery management. This 1.6 GHz Atom N270 processor also includes a power-optimized front side bus of 533 MHz for faster data transfer on demanding mobile applications and a 512 KB L2 cache (which temporarily stores data). Memory The 1 GB of installed RAM can be expanded to a maximum of 1.5 GB of RAM, DVD/CD Drive Because of its size, the Aspire One does not come with an integrated optical drive, but optional CD/DVD read/write drives can be connected to the laptop via one of the three USB ports, enabling you to create your music mixes, burn movies to DVD, and more. Connectivity This Acer Aspire One notebook has an integrated 54g wireless LAN (Acer InviLink) that's compatible with 802.11b and 802.11g networks and offers Acer's SignalUp technology for enhanced antenna efficiency. This notbook provides the following connections:USB 2.0 ports for connecting a wide range of peripherals--from digital cameras to MP3 players Secure Digital (SD) card reader, also compatible with MultiMedia cards (MMCs) Multi-in-one card reader supports SD, MMC, Memory Stick/Memory Stick PRO, and XD Picture CardsVGA monitor portheadphone jack and 1 microphone jack RJ-45 port for 10/100 Fast Ethernet connectionK modem port (V.90)Screen, Video and Audio The 8.9-inch screen has a WSVGA resolution (1024 x 600) and support for up a 262K color depth. Video is powered by the Intel Graphics Media Accelerator 950, which uses shared video memory with the main memory. Acer's CrystalBrite display technology guarantees the best possible visual experience by preventing the diffusion of surrounding light and internal ray. Compared to normal TFT LCDs, Acer CrystalBrite technology is able to read color coordinates more accurately, thus minimizing distortion and creating high-fidelity colors in all environments. This notebook includes an integrated audio card with Microsoft DirectSound compatibility, and it includes two stereo speakers. What's in the Box This ACER FACTORY SEALED BOX contains the Acer Aspire One notebook PC rechargeable lithium-ion battery, AC adapter, and operating instructions. SpecificationsBattery InformationBattery Chemistry Lithium Ion (Li-Ion)Maximum Battery Run TimeHourNumber of Batteries SupportNumber of CellscellBuilt-in DevicesCamera YesMicrophone YesDisplay & GraphicsColor SupportColors (18-bit)Display ResolutionxDisplay Screen Technology CrystalBriteDisplay Screen Type Active Matrix TFT Color LCDGraphic Mode WSVGAGraphics Controller Manufacturer IntelGraphics Controller Model Graphic Media AcceleratorScreen Size.9"Widescreen YesGeneral InformationBrand Name AcerManufacturer Acer, IncManufacturer Part Number LU.S030B.Manufacturer Website Address www.acer.comMarketing InformationAcer redefines mobile connectivity with the Aspire One ANotebook packed with fun and powerful computing features in a diminutive 8.9" form factor. Aimed at business professionals, students and world travelers, it offers wireless connectivity,Product Line Aspire OneProduct Model AProduct Name Aspire One ANotebookProduct Type NetbookInput DevicesKeyboard Size Standard SizePointing Device Type TouchPadInterfaces/PortsInterfaces/Portsx Mini-phone MicrophoneInterfaces/Portsx Mini-phone Audio OutInterfaces/Portsx VGAInterfaces/Portsx RJ-45 NetworkInterfaces/Portsx DC Power InputInterfaces/Portsx 4-pin Type A USB 2.0 - USBMemoryMaximum Memory.5GBMemory Card Reader YesMemory Card Support xD-Picture CardMemory Card Support Reduced-size MultiMediaCard (RS-MMC)Memory Card Support Memory Stick PROMemory Card Support Memory StickMemory Card Support MultiMediaCard (MMC)Memory Card Support Secure Digital (SD) CardMemory Technology DDR2 SDRAMStandard MemoryGBNetwork & CommunicationModem NoNetwork Standard IEEE 802.11b/gNetwork Standard IEEE 802.3uNetwork Technology Wi-FiNetwork Technology Fast EthernetWi-Fi Manufacturer AcerWi-Fi Model InviLinkPhysical CharacteristicsColor Sapphire Blue and/or WhiteDimensions.14" Height x 9.8" Width x 6.69" DepthWeight.2 lbProcessor & ChipsetBus SpeedMHzChipset Manufacturer IntelChipset ModelGSE ExpressL2 CacheKBProcessor Manufacturer IntelProcessor Model NProcessor Speed.6GHzProcessor Technology Hyper-Threading TechnologyProcessor Technology SpeedStep TechnologyProcessor Type AtomSoftwareOperating System Windows XP HomeSoftware Included Acer eRecovery Management Acer Launch Manager Adobe Acrobat Reader McAfee Internet Security Suite Microsoft Works 8.5 (full version) Microsoft Office Home & Student 2007 (60-day trial)StorageOptical Drive Type Not IncludedOptical Media Support Not Applicable ConditionThese items have been remanufactured by the FACTORY and are in same as new condition.There are no physical defects.They are in manufacturer boxes and include all original manufacturer supplied accessories.day manufacturer's warranty is included. 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Original Apple iPhone* 16GB 3.0 OS *Perfect*FREE SHIPPING Thank you very much, ENJOY!!! tgra (8) selger/08/:52 Fikk det jeg skulle ha, og er fornøyd. Litt treg postgang, men absolutt å anbefale. ikke noe tull. NEW*Mini iPhone*Dual Sim,Quad Band Touch Screen*Limited L@@K Thank you very much, ENJOY !!! kaial (4) selger/08/:38 iphone 3gs evrything okey easy to get contact The new orig. Apple iPhone 3G S 32 GB white or Black 19.6.09 Thank you very much, ENJOY !!! js61 (3) selger/08/:35 Se flere gjenstander fra denne selgeren. | ||||
