^ And along the lines of what Tannin said...
Close-up and Macro...
There's no really fixed definition for the terms, but many people consider "macro" to be close to and greater than 1:1
(one-to-one) image size reproduction. "close-up" is something less than that.
And of course, many (especially zoom)
lenses have "Macro" attached to their name description, like 50-300 Macro, but
when you look at the max mag you see it is sometimes struggling to approach 0.5X - in the "close-up" realm.
There's a lot to "macro" as such, and there are various means of achieving it, including the use of extension tubes,
teleconverters, and close-up
lenses (that attach like filters). They are not (and cannot be) universally effective for all
optical systems. So, if you want "true macro", get a proper 1:1 macro
lens. You then have a choice of what native
focal length to choose, but that anon.
/End (really).