Tamron are here offering a very interesting alternative concept to their already very fine 70-200mm f/2.8 option. Reduce the constant aperture to f/4, retain the high quality level and moisture resistance, and we end up with a much lighter, more compact optic that lends itself much better to travel photography, and indeed in any situation where the reduced bulk and weight are seen as an advantage. It might even cost less. So, voilà! we have the Tamron 70-210mm f/4 Di VC USD lens, reviewed here using the full frame Nikon D810 36MP body.
Handling and Features
Weighing in at a relatively modest 850g (Nikon) or 860g (Canon) the lens feels light and compact for its focal length range. It is a full frame optic, although obviously it can just as well be used on an APS-C body, where the “35mm equivalent” range will be 105-315mm (Nikon) or 112-336mm (Canon). A generously sized and effective petal lens hood is provided and this bayonets cleanly onto the lens. Within this outer bayonet we find a 67mm filter thread.
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https://www.ephotozine.com/article/tamron-70-210mm-f-4-di-vc-usd-review-32256
