Hi sifus, I'm planning to buy a second hand lens. Is there anything particular that I should look out for and check? Thanks.

Hmm, make sure it is working? And no fungus?

Unless if its genuine and under warranty, usually it doesn't matter whether you are buying an Ori or AP lens, though for the latter you probably can nego a bit more hehe XD

How do you differentiate ori and AP lens?

Receipt n warranty card n box

check for crack or scratch on the lens elements (normally dun have, but still give a check)
check for fungus
any part break or crack on the lens barrel
check the zoom ring and focus ring turn smoothly (turn yourself, make sure no clocking/blocking).
bring ur body, check the lens can focus correctly
check the aperture blade working
if there is image stabilizer, make sure it working

This post has been edited by onghy: Nov 19 2014, 08:28 AM