Tom Pfeiffer wrote:
IME, if a lens has been sitting awhile, the contacts oxidize and the simple act
of mounting and unmounting it a couple of times cleans the contacts enough that
it works, if it doesn't, a typing eraser usually does! (It works for the flash
contacts that subtly corrode and leave you without E-TTL, too!)
Be careful with a typing eraser, only use a pink pearl style. The white
erasers usually have grit in them the pink pearls do not. A soft cloth
dampened with rubbing alcohol is another useful thing to clean contacts.....
Most lens (Canon) contacts are gold plated, so oxidation shouldn't be a
problem, although 3rd-party manufacturers aren't always.
Even though contacts are gold plated there is ocassionally some dirt
that collects and causes poor contact..... As we used to say in the
computer business, gold doesn't corrode but it does get dirty. This is
why reseating logic cards is a real fix.....
Bob
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