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Anonymous
On lenses, make sure the focus gears run smooth. Same goes for zoom push/pull or gears as applicable. Make sure there's NO visible oil on the aperture blades and the blades move quickly (if you can see them opening and closing, they're sticky with congealed oil and need servicing)
Check the condition of the shutter curtain, as well as what>>52756said, the mirror, levers + knobs, etc.
Fungus in glass, scratches, places where the coating is screwed. I've heard that lenses with scratched up mounts should not be used on dSLR's because the brass filings can not only make the sensor dirty, but if they're cleaned improperly can actually scratch the sensor's filter.
Also, in flashes + camera bodies make sure the battery compartment is undamaged, free of corrosion. It's also a good idea to do research and make sure that you can get batteries for older cameras that won't throw off / destroy the meter.
If the seller will let you, take a roll of film or shoot a few shots onto a memory card to test it out.
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