You asked

Is the sony fe 85mm f 1 4 gm worth buying used?

Yes, I think it's a good candidate for buying used. My buying used guide makes the case that cameras and lenses are built to last, so a well-kept lens from the used market can give you most of the performance for much less. This one is a fast 85mm prime for full frame, and it fits a long run of Sony E-mount bodies, from the a7 to the a1 and the newer a7 V.

Check the glass for scratches, fungus, and autofocus that hunts or sticks before you pay. Also look at the Sony FE 85mm f/1.4 GM II, which is the newer version if you can stretch to it. If 85mm feels too long, the Sony FE 50mm f/1.4 GM is a more versatile alternative.

Written by Claude from this site's pages.

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