I've got a couple of questions regarding lenses. Hope I can some advice from the folks here
1) How is macro-focusing different from normal focusing? Take 2lenses for example, both are zoom lenses of 70-300mm. But there are 70-300mm Macro lenses. Can't a normal 70-300mm do macro-focusing?
2) So far I've been using zoom lenses. There are standard focal length lenses out there, e.g. 50mm. Again, why is there a need for such standard focal length lenses, when a zoom lens e.g. 17-85mm can also be set to 50mm?
Thanks for the help!