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A thought, but Canon and Nikon each have competing lenses that are pretty much the staple diet of pros, being good lenses in all aspects so they rely on them. The 70-200mmm f2.8 is one such "must have" lens. These are lenses they have always had and they don't get updated often because there is little to improve on, its not like the megapixel race to suck in consumers. As a by product of this pro photographers often upgrade when an updated version does get released, its a tax write off and they get a new lens. Consequently around tax time and after a major lens release bargains of the previous versions can be picked up. I was prompted to make this post since Nikon have just announced an updated 70-200 f2.8 lens, so anyone interested in getting one should keep an eye out on price drops of existing stock of this lens. This phenomena occurs with the "legendary" (not consumer level) nikon and canon lenses, not stuff like Samyang or Tokina but you might get lucky on some Sigma.
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