What is the cut-off for counting as a macro lens? 1:2 in 36x24mm format and thus with a minimum field size of 72x48mm (about 3" by 2") seems a bit marginal compared to modern alternatives.
IMO, as someone who shoots macro quite a bit, the range of what I consider to be macro lenses
begins at 1:4 (which most people call 'close-up') ... and becomes definite at
1:2 (where every lens of this magnification is defined as a macro lens) ... and finally matures at
1:1 (which is considered the iconic standard, where the majority of macro lenses are found).
As macro work progresses in magnification,
2:1,
3:1, and even
4:1 ... these are considered "super-macro" magnifications levels, and are the inverse of the above-described.
As magnifications get greater still (
5:1 and beyond), a person is no longer shooting 'macro' ... but is now getting into
Photomicroscopy ... as almost invariably a microscope optic is deployed at this point.
Again, IMO