Is a used Canon RF 50mm lens safe to buy on eBay?

Yes—buying a used Canon RF 50mm lens on eBay can be safe, but only if you treat it like a condition-and-return-policy purchase, not a blind bargain.

Best approach:

1. Prefer listings with clear photos of the exact lens, including front glass, rear glass, mount, barrel, and contacts.
2. Buy from a seller with strong recent feedback and a clear return window.
3. Make sure the listing explicitly says the lens is functional and that image quality is not affected.
4. Avoid listings with vague wording like “untested,” “as-is,” “for parts,” fungus, haze, separation, impact damage, or autofocus issues.
5. Check that it is the right mount: Canon RF, not EF or EF-S (which require an adapter to work on RF-mount mirrorless cameras).
6. Compare the used price against new/refurbished prices; if the savings are small, new or refurbished may be the safer buy.

For the Canon RF 50mm f/1.8 STM specifically, used copies are common enough that you do not need to accept a risky listing. A “Good” condition listing can be fine if it says image quality and use are not affected, but the return policy matters more than the condition label alone.