Nevertheless, if you need a lens for your wildlife or action work then you have got to take a look at this lens and while it is still a significant outlay, it’s nothing like the sort of cash you have to pay for a camera brand lens of similar spec so it is very good value for money. It’s capable of excellent quality images assuming you get everything right – it is demanding on your technique. High-spec telezooms don’t come cheap, but I’d have to say this Sigma is a bit of a bargain – and even more so if you go for the lens/converter bundle. The difference between the Sigma 150-600mm f5-6.3 DG DN OS going up to 600mm versus the Tamron 150-500mm f5-6.7 Di III VC reaching only 500mm is visible but might not be the decisive factor for choosing a zoom lens. At 840mm the effective maximum aperture is f/9 and you have to say that the result is good enough even for critical use. Above: Tamron 150-500mm f5-6.7 Di III VC coverage on a full-frame camera at 150mm (left) and 500mm (right), Distortion Compensation AUTO. I then fitted the 1.4x teleconverter and repeated the test… Fitting an optical accessory between lens and camera inevitably impacts on image quality but the good news is that the drop-off in image quality in terms of sharpness and contrast is minimal. Even better news is that the best quality, centrally and at the edges, comes at the wider apertures with f/8 being only slightly better than f/6.3 and both good enough for critical use. That high level of performance was maintained at the 600mm setting too and you get impressive sharp, contrasty images. The Sigma starts out pretty strong, with even overall performance, but gets much worse towards the long end of the range, while the Tamron starts out weaker at short focal lengths and tends to keep the performance well-balanced towards the long range.
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