You asked
What is the canon ef s 60mm f 2 8 macro usm good for?
The Canon EF-S 60mm f/2.8 Macro USM is a close-up lens for Canon APS-C cameras. On APS-C it frames like about 96mm on full frame, so you can get close to small subjects such as flowers, insects and product details while keeping a comfortable working distance. At f/2.8 it gives about the depth of field of f/4.5 on that sensor. It autofocuses but isn't stabilised, so a tripod helps for slow, static work.
It only fits APS-C Canon bodies. The Canon EOS 90D and Canon EOS 80D are both sensible partners. If you're weighing up why the crop matters for this kind of work, Sensor sizes covers the trade-offs, and Canon EF lists the mount.
Written by Claude from this site's pages.