The bugbear I have with taking macro shots is lighting. If you intend to use ambient light or onboard flash the lens can make unwanted shadow.
If you have plans to use a Tripod with ambient light, a lightbox or bounced light / flash, that will help.
My two suggestions are my current macro lenses, usable at other than macro distances, can be had relatively cheap.
1) SIGMA 50mm F2.8 MACRO, 1:1 possibilities but you get quite close to the subject. Manual focussing is easy at macro distances.
2) TAMRON SP90 adaptall, 1:2 on it's own or 1:1 with a matched tube or 2x teleconverter. Provides more distance from subject. A PK-A Tamron Adapter is best if you want auto exposure and avoid green button metering.
These are not the best necessarily, just the ones I own.
There are many many threads regarding "macro" in this forum regarding ways, means and lenses. Should you search out and read many of the posts, you will not be wasting your time, lots of information to be gleaned from members, some of which will no doubt be provided in answers to this question you have posted.
If you see any "macro" 50mm, 90mm, 100mm (or if you are really lucky 180 - 200mm) prime lens going cheap, snap it up, they can be very expensive and mostly hold their value if not increase should you get lucky!
Last edited by Skodadriver; 02-19-2018 at 02:24 AM.
Reason: Duplicated comment.