The welcome pays close attention to " a bit wisdom interest " , my general solves all problems of camera, photography, journey for you!
This problem does not have fixed answer, the most accurate understanding should be to do not have the most practical aperture, have the aperture that suit only. Beautiful can have the scene of many 70-200, a best camera lens is EF 70-200mm F/2.8L IS II USM, not only constant F2.8 aperture, still take prevent tremble and all sorts of technologies, and one the cheapest is whats do not take F4 aperture, price of two camera lens and picture also differ character many.
And film actually in the process, the big aperture that some filming that setting does not need F2.8 too and prevent tremble, for instance outdoors scene films, general metropolis uses tripod and F8 such small aperture, but in news photography and the situation with a few bad lights fall, aperture of use F2.8 of a lot of people cooperates to prevent tremble undertake filming, with raising filmed successful rate, accordingly, when choosing camera lens, the effective demand that wants him foundation will choose, the camera lens of F2.8 aperture also is met heavier, do not suit to be borne for long.
Cast 70-200 this anxious paragraph, actually still a lot of camera lens are put in such doubt, 16-35 is for instance anxious paragraph camera lens, beautiful can have the product of corresponding F2.8 and F4 aperture with Ni Kang, when I am choosing, can film according to mine content undertakes choosing, when camera lens is for instance much, I aux would rather the choice is light quantified F4 camera lens, because I can make up for one part to draw simple question in later period, and in crucial circumstance, the acme picture that I need F2.8 camera lens is qualitative.
So, the requirement that wants him foundation chooses camera lens. Did not say which more practical ~
