I'm very new to the DSLR business. I want a 100mm Macro lens for closeup dental shots.It must have the option to change from manual to auto focus. Must have a large depth and field of view. What body reasonably works, and what about the lens designations themselves. I'm a total ignorant and please spare no details.
For example, EF 100mm f/2.8 Macro USM
^ I know 100mm but what is f/2.8? USM? EF?
Thanks
Added (1). Now I get it!!! Thanks to Andrew, Tony and Jeffrey.
См. статью: DSLR lens designations for Canon/Nikon?