How to test a lens for issues before buying used
Jay Aquino wrote:
I don't know what anyone else does, but this what I do:
(1) Talk to the owner to get a sense of the seller. Find out the history.
(2) Take note of any body damage, etc. Chips. Honestly, lenses don't have to be pristine but you are looking for impact damage not paint issues.
(3) Look through the lens from the end from the back and from the front to check for fungus. Check for scratches, but normally not a big issue unless its majorly obvious.
(4) Turn the zoom and focus rings to check for tightness and roughness.
(5) Bring you body, laptop and tripod and make test shots throughout the range of the lens. View on your laptop. Research the normal characteristics of the lens to you can make you evaluation.
(6) I like to have to box, but its not necessary.
(7) check the aperture mechanism. Set the AE mode to "A" and while pressing the DOF Preview button, run the aperture setting from large to small and back. Note that the aperture works correctly.
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