Tamron SP AF 70-300mm f/4-5.6 Di VC USD - £340/$450
There's a focus distance scale at the back end of the lens, under a viewing window, and focusing is fully internal, so there's no movement or rotation of the front element.
Its heavy-duty build helps to keep things steady during handheld shooting, aided by Tamron's four-stop optical stabiliser. Sadly, the stabiliser is omitted in the Sony-fit version of the lens. At least the Sigma 70-300mm OS gives Sony users the choice of using optical or sensor-shift stabilisation.
Build quality feels robust, although the zoom ring feels a little jerky and there's no weather seal on the mount.
Lab tests are a little disappointing, suggesting a lack of sharpness and poor colour fringing control at the 300mm end of the zoom range. In practice, however, fringing is normally only noticeable around extremely high-contrast edges towards the corners of the frame, such as dark tree branches against a very pale sky. Image quality is still sharp and punchy at 300mm.
Sharpness test
Plenty of contrast and, despite poor-looking resolution figures at 300mm, images appear very sharp and detailed.
Fringing test
Very high contrast edges near the corners of the frame produce a little colour fringing that's noticeable at the longest zoom setting.
Distortion test
No glaring distortions at any focal length setting throughout the zoom range. Pincushion distortion is most noticeable at 300mm.
Image test verdict
The Tamron may not look super-special based on lab data, but real world image quality is excellent in all sorts of different lighting conditions.
Read the full Tamron SP AF 70-300mm f/4-5.6 Di VC USD review