maller and barely more than half the weight of the Tamron’s 150-600mm lens onwith switchable panning modes. Whereas the Sigma has a three-position autofocus limiter switch for locking out the short or long end of the range, the Tamron has a single ‘Limit’ position on the AF/MF focus mode selection switch. This limits the autofocus range on one side of the current focus distance position or the other. Image quality and all-round performance are impressive but edges-harpness is lacklustre at the short end.
