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

Product Information

This lens is very well built and has a metal mount. On the lens there are two on/off switches: for autofocus and for image stabilization. The focus ring is two cm wide and covered with rubber. That feels good. The zoom ring is wider and covered with the same kind of rubber. What you encounter less and less today is a window on a lens in which you can see the distance that is in focus. With telephoto lenses, it can be really convenient. This is an lens that uses internal focusing (IF). The front lens therefore doesn’t turn during focusing. This is useful when using a gradient filter or a polarizing filter. Vignetting 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.

D700 / SP 70-300mm F4-5.6 Di VC USD / 4,256×2,832 / 1/80秒 / F5.6 / +0.3EV / ISO200 / 絞り優先AE / WB:雲天 / 300mm By 300mm, this lens delivers poor image quality across the frame (except on the far left side of the frame). The focusing ring is about 3/4'' wide, also rubber with ribs. The focusing ring ends at soft stops at the close-focus and infinity focus points, and will focus past infinity. D700 / SP 70-300mm F4-5.6 Di VC USD / 2,832×4,256 / 1/50秒 / F4.5 / -0.7EV / ISO200 / 絞り優先AE / WB:晴天 / 140mm We haven't yet tested Sony's direct competition - it doesn't offer image stabilization because Sony dSLR cameras offer in-body stabilization instead. It does offer SSM focusing.This will be noticeable in certain shots - such as when an evenly-blue sky is in the corner of a frame. 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. Both lenses are sharp wide open and improve a little on stopping down. However they can both be used wide open without worrying too much about image quality. Technically, the Tamron overall sharpness probably peaks at around f8 (center) and f11 (corner) at all focal lengths, but the difference between wide open and stopped down is quite small and shooting wide open (and hence with a faster shutter speed or lower ISO setting) will often give the best results.

The lens is equipped with ultrasonic autofocus drive USD (Ultrasonic Silent Drive). It achieves faster focusing making this telephoto lens perfect for photography of sports, vehicles, and other fast-moving subjects. With advanced motor technology and software, Tamron's USD delivers precise and noiseless focusing at turbo speed. Ma è normale che sia così: non per niente infatti costa quasi due terzi in meno, per esempio, di obiettivi professionali tout court come il Canon EF 70-300 mm f/4-5.6L IS USM! In the pursuit to achieve the most outstanding image resolution in the 70-300mm class, Tamron’s Anniversary lens - the SP AF70-300mm F4-5.6 Di VC USD (Model A005) - utilizes an advanced optical design that features a LD (Low Dispersion) and an XLD (Extra Low Dispersion) lens element made from specialized materials that prevent chromatic aberration. As a result, the SP AF70-300mm F4-5.6 Di VC USD (Model A005) boasts sharper contrast and greater descriptive performance than all others in its class. 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 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

Usato in vendita

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. Here is a comparison of the aperture step down between the Tamron and some Canon telephoto lens models. CA is very well controlled in the Tamron 70-300 VC, with only a small amount of CA apparent in full frame corners. Finally here are 100% crops from shots taken at 70mm, again with an EOS 7D showing center and (APS-C) corner quality.