Posted 20 hours ago

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

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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. The chromatic aberration at all focal length/aperture combinations is reasonably low. Telephoto lenses are in theory sensitive to chromatic aberration. Therefore, the design often utilizes more expensive types of glass to combat chromatic aberration. In the design of this lens, which is made up of 17 elements in 12 groups exist, there are two lens elements with a higher refractive index (low dispersion & ultra low dispersion) included. That’s relatively few, and it keeps the cost down. And it seems to be reasonably effective. In the extreme corners you will, only at large magnifications of uncorrected RAW files, sometimes find visible purple and green edges at sharp contrast transitions. Those are easy to correct with software afterwards. D700 / SP 70-300mm F4-5.6 Di VC USD / 4,256×2,832 / 1/80秒 / F5.6 / +1EV / ISO200 / 絞り優先AE / WB:雲天 / 155mm Below are 100% crops from shots taken at 135mm with an EOS 7D at ISO 1600. They show image quality in the center of the frame and at the lower left corner of the (APS-C) frame. D700 / SP 70-300mm F4-5.6 Di VC USD / 4,256×2,832 / 1/40秒 / F4.2 / -0.7EV / ISO400 / 絞り優先AE / WB:晴天 / 116mm

but the relatively narrow aperture typically found in this class of lens removes low light action from its uses list. I have had quite some lenses. With my canon 550d and 5d mark III i had the 50mm prime, the 70-300 IS, the 70-300 IS L, the 70-200 4.0 L and the 70-200 2.8 II (twice). Now i switched to Nikon and i have the 35mm prime and the 18-105 kit lens. Questo Tamron 70-300 è un obiettivo efficiente, versatile e capace di fornire eccellenti prestazioni a 360°. As usual, a low percentage of sharp images can be captured at even longer exposure durations - as low as 1/10 at 300mm.Here is a comparison of the aperture step down between the Tamron and some Canon telephoto lens models. 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. The other standout feature is Tamron's Vibration Correction (VC) system - an optical stabiliser that offers 4-stop performance in fending off camera-shake. Again image quality is similar, good out to the corners of the APS-C frame and chromatic aberration is not visible. 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

Tamron’s USD works with the high-frequency ultrasonic vibrations that are produced by a ring called a ‘stator’. Energy from the vibrations is used to rotate an attached metallic ring known as the ‘rotor’. Piezoelectric ceramic, an element that produces ultrasonic vibrations when voltage of a specific frequency is applied, is arranged in a ring formation on the stator. This electrode configuration of piezoelectric ceramic causes two ultrasonic vibrations to occur in the stator. New optical system optimized for digital cameras achieves top resolution in the 70-300mm class with specialized glass elements including an XLD (Extra Low Dispersion) lens Qui il Tamron SP 70-300 F/4-5.6 Di VC USD si comporta così così, soprattutto rispetto alle lenti più recenti, che presentano di solito caratteristiche tecniche tali da minimizzare questo difetto (per approfondire, vai all’articolo sulla aberrazione cromatica) Image stabilization is always difficult to test in any quantitative fashion. To look at these two lenses I tried several techniques but basically it boils down to taking lots and lots of shots at various shutter speeds with each lens and then looking at all the images and coming up with some sort of statistical assessment of sharpness. Ogni modello di obiettivi fotografici riporta delle sigle che ne indicano particolari caratteristiche o funzioni.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。 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. Eccolo qua sotto, il Canon appena menzionato. Noterai la differenza con il Tamron soprattutto alle focali maggiori. E naturalmente al momento di aprire il portafoglio per comprarlo! Sony mount is not equipped with the VC image stabilization mechanism, as anti-shake functionality is included in the body of Sony digital SLR cameras. Consequently, the name of the Sony mounted lens, SP 70-300mm F/4-5.6 Di USD, does not include the VC description.

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