The narrower aperture range of f/5-6.7 is going to restrict you a little in terms of how much light you need, which is simply something to be aware of and factor in. The linear stepping motor is blisteringly speedy and practically silent – in other words, exactly what you want for birding. Going up to 500mm, while not the longest lens on this list or even in the Sony section, is pretty handy, and it's helped by the Tamron lens's real ace in the hole: it's super-fast autofocus system. The Tamron 150-500mm f/5-6.7 Di III VC VXD is a lens designed exclusively for Sony E-mount it's made for full-frame bodies, but will work with APS-C, delivering an effective focal length of 225-750mm (though it will produce a pretty unbalanced setup). Sharpness, contrast and other image attributes are excellent and very consistent throughout the entire zoom range. The optical image stabilizer is effective on its own and even better when coupled with in-body stabilization, featured in later Sony Alpha A7 and A9 mirrorless cameras. DDSSM (Direct Drive Super Sonic Motor) autofocus is super-fast and comes complete with customizable focus-hold buttons mounted around the barrel.
This makes it easier to track the erratic movement of birds in flight. Triple-mode image stabilization is switchable for static and panning shots, with an additional option for applying stabilization only during exposures. The maximum ‘effective’ focal length stretches from 600mm to around 900mm when shooting on an APS-C camera. The Sony’s size and weight are fairly typical but feel a little more imposing on comparatively lightweight Sony Alpha mirrorless bodies. This recent addition to Sony’s E-mount line-up has the same 600mm maximum focal length as Sigma and Tamron 150-600mm zooms for Canon and Nikon SLRs.
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