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. Here is a comparison of the aperture step down between the Tamron and some Canon telephoto lens models. The lens is equipped with Tamron's first-ever 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 newly developed software, Tamron's USD delivers precise and noiseless focusing at turbo speed. Per la focale che ha... è davvero leggero, il suo f/4-5.6 è assolutamente giusto, non la reputo una lente più buia di altre.

If you compare the sharpness of the Tamron SP 70-300 mm with the sharpness of more expensive 70-300 mm zooms from other brands, this Tamron is the man. The center sharpness, expressed in lines/sensor height, is generally high. Only at the longest focal lengths is the center sharpness visibly lower. If you have a shot made at 300 mm blown up to 100% on your screen, then it looks less sharp, woollier than pictures made at shorter focal lengths. That is not an unusual occurrence with telephoto zoom lenses; only the most expensive zoom lenses also perform excellently at the longest focal length. The edge sharpness is lower than the center sharpness. This difference is visible at 300 mm, but at all the other focal lengths the corners are still so sharp that in practice, most photographers won’t notice that the center is even sharper. The Tamron SP 70-300 mm VC is equipped with Tamron’s VC (Vibration Compensation), a 3-axial image stabilization system. It is reasonably compact and – compared to brighter telezooms – reasonably light. It’s an ideal candidate for a test with the Nikon D7100. Review Tamron 70-300mm f/4-5.6 Di VC USD SP AF + Nikon D7100 I had to spend a more-than-usual amount of time focus testing this lens - just to confirm what I was seeing. Dotato di Full Time MF (cioè, la messa a fuoco manuale è sempre possibile, anche quando l’obiettivo è settato su AF) First here are 100% crops of shots of the moon. These were taken using a sturdy tripod and the best shot of a sequence chosen since atmospheric effects can sometimes blur images. In the case of both the Tamron and Canon lenses the image is slightly sharper in the center of the frame and the image at the corner of the frame shows some chromatic aberration.By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations that produced simple motion into energy known as ‘deflective traveling waves’, which then moves around the circumference (rotation direction) of the ring.

You won’t find any lateral chromatic aberration in jpg files with the Nikon D7100. The camera corrects chromatic aberration in all jpg files, even for non-Nikon lenses. Conclusion Tamron 70-300mm VC AF review Pros The Tamron 18-200mm f/3.5-6.3 XR Di II Lens and the Sigma 30mm f/1.4 EX DC HSM Lens are the only non-Nikon lenses The Canon and Tamron 70-300 zooms are pretty much equal in terms of sharpness in the center of the image at all focal lengths from 70mm to 300mm. Both are very good for this class of lens. They're not quite up to prime lens levels of sharpness, but they can be surprisingly close. I actually view this as a positive attribute as it forces proper use of hood (I see hoods used in reverse position FAR too often).

Tamron 70-300 F/4-5.6 Di VC USD SP: cosa significa?

Besides allowing sharp handheld shots to be captured at shutter speeds longer than needed without stabilization, image stabilization makes perfect framing much easier. One of Nikon's better lenses, the Nikon offers superior sharpness, but poorer CA performance, when compared to the Tamron. We haven't had an opportunity yet to test this lens on a full-frame body. Otherwise, both lenses feature USM style focusing and image stabilization.