Definitions for "macro lens"
a camera lens designed to focus at short distances so as to achieve photographic magnifications of objects larger than with standard lenses.
A lens that provides continuous focusing from infinity to extreme close-ups, often to a reproduction ratio of 1:2 (half life-size) or 1:1 (life-size). Nikon's version for their "macro" is "micro", eg. 105mm F2.8 Micro-Nikkor.
A lens designed to produce very high sharpness when focused up-close; a lens that produces a ratio of 1:1 when used up close.
Keywords:  fun, lot, expensive
a lot of fun, but more expensive
Keywords:  accomplish, necessary
a necessary to accomplish this