You asked

Is the ttartisan 40mm f 2 8 macro worth buying used?

I can't tell you what this lens costs used, because the site doesn't track prices. What I can tell you is whether it suits you. The TTArtisan 40mm f/2.8 Macro is manual focus with no stabilisation, and it's made for APS-C sensors. On those bodies it frames like about 60mm on full frame, so it's a good fit if you want close-up work and don't mind focusing by hand.

Buying used is a sensible way to try it, since a manual lens is a low-risk purchase. Good matches include the Fujifilm X-T5 and the Sony a6400. For the general approach, see buying used.

Written by Claude from this site's pages.

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