10-02-2012, 10:40 AM
What do you mean with "easy to use"?
Focal lengths determine what you want to use a lens for. If you want to photograph a bird in a tree some distance away. one would want a long focal length, like a 400mm or 500mm lens. If one wants to capture a building from a relative close distance, one would want a short focal length, like for instance 12mm to capture the whole building.
To me it is not clear what you mean with that 50mm and 85mm lenses are "easy to use".
You have a 17-55mm f2.8 IS USM lens at the moment. What is it you look for that that lens does not offer you?
Focal lengths determine what you want to use a lens for. If you want to photograph a bird in a tree some distance away. one would want a long focal length, like a 400mm or 500mm lens. If one wants to capture a building from a relative close distance, one would want a short focal length, like for instance 12mm to capture the whole building.
To me it is not clear what you mean with that 50mm and 85mm lenses are "easy to use".
You have a 17-55mm f2.8 IS USM lens at the moment. What is it you look for that that lens does not offer you?