Details:
No scratches on the glass
No cleaning marks on the glass
No fungus
Focus ring smooth in operation
No oil on blades
Diaphragm operating correctly
Filter ring not damaged
A note about dust:
All used lenses will have some dust in them, sometimes even new lenses. Most dust will not affect a photo because all of the image passes through all of the glass with the result that dust is 'averaged out'. I do not specifically mention the amount in dust in a lens unless I spot a large particle, or if there is lots of it. If you do not wish to buy a lens with dust in it, then you do not want a used lens, and should contact the manufacturer of your camera for a price list of new lenses.
