There is always a risk associated with buying second hand goods, and it is true for the second-hand SLR/DSLR lenses. Many amateur photographers goes for second hand items due to the high prices of the new lenses. It is very important for these DSLR users who are on the market for a used lens to know how to inspect a lens and decide if it is functioning as it has to be.

Photo-mentor.com published a very good second hand lens buying guide, which is supported with nice photos and personal experiences. I strongly advice you read this article especially if you are an amateur and not experienced so that you won't have to pay more for less.

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Buyer's guide: How to check a second-hand lens

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