How to examine a lens

[kartracer]

I'll be looking at some used lenses soon (maybe 17-55mm, 80-200mm / 70-200mm Nikon, etc.) and would like to be sure that the glass is good, along with functions. Can anyone offer any tips/advice on how to check over the lenses (especially coatings, etc.)?

I've used good glass before on film cameras, but its been a while since I had my hands on any lenses like those above. I'm wanting to upgrade and get good glass to use with my DX.

 

[trevorbray]

I just trust my eyes, have a good look at it and through it. get a couple of shots and examine those. Be sure there are no Fungus, dents, scratches on the glass. Not sure how to check on the conditions of any coatings.

 

[Markk]

Always check manual focus. I had a problem on my 17-55 with the focus ring not engaging but noticed it too late as I'm always on AF. Check the metal attachments to the camera for significant wear and take a look at the filter threads. Screw ona filter to check for smoothness. I wouldn't know how to check coatings. Good luck!

 

[NikonSimon]

The only used lenses I buy are off MPB now really, and I trust their judgement with their 'rating'.

Matt told me they thoroughly check each lens, cosmetically and optically, so I have faith that my 50mm 1.8D that arrives tomorrow is really in Exc++ condition