No, it just has more available aperture. It's common to see a consumer telephoto with a max of 5.6, and a similar length pro version with 2.8, for example. Wh

No, it just has more available aperture. It's common to see a consumer telephoto with a max of 5.6, and a similar length pro version with 2.8, for example. Which makes it bigger and heavier, harder to manufacture, and smaller market - all of this pushes prices up (an order of magnitude is common)