Tamron A005E SP AF 70-300 F/4-5.6 Di VC USD Lens for Canon

Product Information

A gyors autófókusz nem elég: fontos, hogy a bemozdulásos elmosódást is elkerüljük. A VC objektívek kiállták a próbát: elmosódás nélküli, éles képeket készítenek, igencsak rossz fényviszonyok között is. USD

I tested the Tamron SP 70-300MM F/4-5.6 Di VC USD against a Canon EF 70-300/4-5.6 IS USM using an EOS 7D DSLR, which currently has the highest native sensor resolution of any Canon DSLR (and in fact of any DSLR). With 18MP in an APS-C frame the theoretical resolution limit at the sensor is 116 lp/mm (neglecting any blurring as a result of the low pass filter over the sensor). I also used an EOS 5D to look at the image quality at the edges and corners of the full 35mm frame. With the USD, the friction between these deflective traveling waves created on the metallic surface of the stator and the surface of the rotor produce force, causing the rotor to rotate. The focusing ring lens, which is linked to the rotor, is thus moved, creating a fast and smooth auto-focus drive. Finally here are 100% crops from shots taken at 70mm, again with an EOS 7D showing center and (APS-C) corner quality.Combining a somewhat slow AF speed with a relatively narrow aperture means that this lens is not the best choice for sports photography. USD」（Ultrasonic Silent Drive）を採用しており非常に静かで高速なピント合わせが可能になっている。実際に使用してみると、非常に静かで室内で使用してもほとんど音が気にならない印象。野外で撮影している場合は、まったくAF作動音は聞こえない。AF速度も速く、思い通りの場所に瞬時にピント合わせが可能だった。 D700（DXフォーマットのクロップで撮影） / SP 70-300mm F4-5.6 Di VC USD / 1,848×2,784 / 1/1,000秒 / F7 / -0.3EV / ISO200 / 絞り優先AE / WB:晴天 / 300mm If you consider this a 70-200mm lens, you will be more happy than if you are counting on getting great 300mm image quality.

D700 / SP 70-300mm F4-5.6 Di VC USD / 2,832×4,256 / 1/2,000秒 / F6.3 / -1EV / ISO200 / 絞り優先AE / WB:晴天 / 70mm By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations to produce simple motion into energy known as ‘deflective traveling waves’, which then moves around the circumference (rotation direction) of the ring. There is also the risk of a problem that results in the lens and body manufacturers directing blame at each other. Az optika belsejében találhatóak alacsony (LD) és extra alacsony szórású lencsetagok is (XLD). Utóbbiak olyan különleges üvegből készülnek, ami a fluroithoz hasonló törésmutatóval rendelkezik. A törésmutató az anyagok fénytörési képességét méri: minél kisebb az érték, annál inkább alkalmas arra, hogy jó képminőséget biztosítson, és javítsa az optikai teljesítményt. Ennek az anyaghasználatnak köszönhető, hogy eltűnik a kromatikus aberráció, ami korábban sok problémát okozott a telefotó fotográfiában. A végeredmény így mindig torzításmentes, éles és magas színhűségű kép lesz az egész zoomtartományban. VC képstabilizálás (Vibration Compensation)

Generating a list of uses for a 70-300mm lens is a daunting task (it includes family life, vacations, landscapes, travel, wildlife), The SP 70-300mm F4-5.6 Di VC USD employs Tamron’s esteemed image stabilization mechanism–VC (Vibration Compensation) seen in both the AF18-270mm Di II VC (Model B003) and SP AF17-50mm F/2.8 XR Di II VC (Model B005). With VC, the photographer has the freedom to shoot at a shutter speed that is an extra four stops slower without having to worry about blurring. This makes capturing handheld, evening, night, and interior shots much easier. This lens’ advanced optical design employs a sophisticated XLD (Extra Low Dispersion) lens element made from specialized high-grade glass that has lower dispersive properties than standard LD lenses (where refraction causes the dispersion of white light into spectral hues). The dispersive properties of the XLD lens are at a level similar to fluorite, and in combination with a LD element make for an optimal optical design that delivers best in class resolution with advanced axial chromatic and magnification aberration correction - major inhibitors of image quality enhancement. The result is a lens that delivers sharp contrast and better descriptive performance throughout the entire zoom range.

Di seguito qualche considerazione su come si comporta il Tamron 70-300 rispetto ai principali difetti ottici: Nitidezza Doesn't feel special like the L lens either, but of course not much does and it would be cruel to expect a 300GBP lens to do so There are seven Nikon lenses with a 62mm filter size in my database, but Canon owners may be buying a set of filters specifically for this lens - a cost that must be considered.

Image Stabilization

Nettement plus abordables, plus légers et moins encombrants que les 70-200 mm f/2,8 constant siglé "pro", les principaux fabricants disposent actuellement dans leur gamme d'un modèle 70-300 mm f/4-5,6 stabilisé.

There's some distortion present in images shot with the Tamron 70-300mm ƒ/4-5.6, but no more than other lenses in this category. At 70mm, the distortion is almost negligible - just a slight amount of barrel in the corners. From 135mm and on, there's significant pincushion distortion in the corners. As usual, this distortion is much more significant when the lens is used on full-frame cameras such as the 1Ds Mark III. March 9, 2010, Saitama, Japan– President and CEO Morio Ono of optical equipment manufacturer Tamron Co., Ltd., announced another advance in their pursuit of high resolution images in the telephoto lens category with the development of a 70-300mm F/4-5.6 telephoto zoom lens featuring image stabilization––VC (Vibration Compensation) and an ultrasonic auto-focus drive –– USD (Ultrasonic Silent Drive). The SP 70-300mm F4-5.6 Di VC USD (Model A005) high-resolution DSLR telephoto zoom lens has been produced for the Nikon mount, with the development of compatible mounts for Canon and Sony to follow *3.As usual, a low percentage of sharp images can be captured at even longer exposure durations - as low as 1/10 at 300mm. The internal focusing mechanism also means that the front element neither extends nor rotates throughout the focus range, which is a bonus when using rotation-specific filters such as a circular polariser or graduated neutral density filter. The Canon's advantages include modestly lighter weight, better AF accuracy, less vignetting and less pincushion distortion through 200mm.