The Tamron SP 150-600mm F/5-6.3 Di VC USD is one of a select group of supertelephoto zooms for full frame SLRs that reaches or exceeds 400mm focal length, while still being reasonably portable. This type of lens is the tool of choice for small or distant subjects when large heavy primes are impractical, ranging from birds and wildlife, through sports, to aircraft and the like. The Tamron's trump card over its closest competition (the Sigma 150-500mm F5-6.3 DG OS HSM and the various 400mm telezooms from the camera makers) lies in its longer focal length - at 600mm full zoom, it'll let you get your subjects that bit larger in the frame.
Tamron announced the lens at the end of 2013, which means it's the most modern in its class, and therefore, in principle, has the most up-to-date optics. It includes several features that are more-or-less essential to this type of lens - optical image stabilization (which Tamron calls Vibration Compensation, or VC for short) and an UltraSonic Drive motor for fast, silent autofocus (hence USD). It also comes with a collar for attachment to a tripod or monopod; at almost 2kg (4.3lb) in weight, you're probably not going to want to shoot it hand-held for long.
One point worth noting is that the lens has a decidedly slow maximum aperture, starting at F5 and dropping to F6.3 at full telephoto. This is the price you pay for getting such a long zoom range at all; Sigma's 150-500mm offers the same aperture range, and the camera manufacturers' closest equivalents tend to max out at 400mm F5.6. However with the high-ISO capability of modern sensors, this is no longer so limiting as it might have been just a few years ago.
The Tamron isn't just for full frame cameras: it can also be used on APS-C SLRs, on which if offers a huge 225-900mm equivalent range. If you're thinking of going on safari, or even just to your nearest airshow, this makes it a hugely tempting prospect. Of course this long zoom comes at a price - at around £950 / $1070, it's notably more expensive than the older Sigma. However it starts to look like a bargain when you realize how much Canon, Nikon or Sony are asking for their 400mm telezooms. Read More:-
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