Originally Posted by
DanK
There is no clear line between macro and nonmacro work. Lens manufacturers often stick "macro" on lenses that don't allow a level of magnification that most macro photographers consider macro, but there is no clear line between macros and other closeups. Wikipedia defines it as at least a 1:1 magnification ratio (the image on the sensor is at least as large as the object), but no macro photographers I know follow that definition. For example, most macro lenses top out at a magnification of 1:1, so if you follow the wikipedia definition, the only photos taken with those lenses that count as macro would be the ones taken at minimum focusing distance.
I have done a lot of macro over the past decade, and I'm guessing (I have no way to check) that in terms of magnification, most fall in the range of 1:2 to 2:1.
One issue with macro--which shows up in your photo of the edge of two coins--is that the depth of field is extremely narrow. There are only a few options for lessening this problem:
1. Shoot with a smaller aperture.
2. Keep the subject as close to parallel to the sensor as you can, to minimize the depth of the image.
3. Focus stack.