18th January 2004, 10:24 PM
18th January 2004, 11:39 PM
18th January 2004, 11:51 PM
Sorry, can only answer your Q1. Not an expert in macro photography. Basically all lenses have a minimum focusing distance. It can range from a few cm to who-knows-where. For example, my 50mm can focus to as near as 0.38m while my 70-300mm zoom macro can focus to around 0.9m.
Originally Posted by andy9110
Any nearer than the minimum focusing distance your lens will not lock focus.
As for the magnification ratio at the minimum focusing distance, it again depends on the lens specs. Look through your lens manual for the info.
19th January 2004, 08:38 AM