While both lenses have a focus limiter switch, with settings between Full and 10m (Sigma) or 15m (Tamron) to infinity, the Sigma features a third option on the limiter switch for 10m to 2.8m. The minimum focusing distance on the Tamron is just slightly less than the Sigma – not a game changer, but nevertheless a plus for the Tamron. Both did a fair job when grabbing focus, though neither lens is going to focus as quickly as a much more costly 600mm prime lens. I did not notice any major difference in the focusing responsiveness between the two lenses. As for the Sigma, it has an extra setting on the autofocus switch for manual override (MO) which combines autofocus with an option to manually focus. The Tamron features a larger, thicker focusing ring than the Sigma, which makes it easier to manually focus the lens. All images in this article were captured with the Sigma 150-600mm with the 1.4x TC. In this article I’ll be applying both of these considerations as I review Sigma’s new bundle, and make comparisons between the Sigma and Tamron lenses. There are two things to consider when looking at a new lens: (Nikon crop sensors are 1.5 and Canon, 1.6) The 1.4x TC makes the 600mm, an 840mm on a full frame camera, so in theory this allows my full frame camera to shoot wildlife with nearly the same zoom factor as a crop sensor. Since I shoot mainly with a Nikon D750 full frame, the lens bundled with a 1.4x TC interested me very much. In addition, Sigma recently began offering a bundle for their 150-600mm with a 1.4x teleconverter. One of my favorite subjects to photograph is wildlife, so when asked to review the Sigma 150-600mm lens, I was excited about the opportunity to see how its results compared to my Tamron 150-600mm.
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