[Rover]

It is about the FOV. If you want a wider FOV for macro, you need a short focal length. A short focal length comes with a small working distance, always.

 

So, you have the choice.

28mm (EOS M), 35mm (EF-S), 60mm (EF-S), 100mm, 180mm. A FOV choice. 

 

I am overly thrilled by this lens, in the sense that if I still had an APS-C DSLR I would get this lens for its wide FOV for close ups, in a heartbeat. Lovely. 

 

At the moment I use a 55mm f3.5 macro on my FF camera, for close ups. Similar FOV. And 90mm and 200mm

 

I may get the 28mm one for my EOS M sometime in future, or even this new 35mm. With IS they even make nice video lenses...

Try it on a FF body through an extension tube - it might work. The working distance might become a problem though.