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10-23-2010, 07:07 PM   #1
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Those contacts on the back of a lens

I've looked at a lot of lenses and notice some have more contacts on the back of the lens than others. And I was wondering, what is the function of each contact? And can a person judge what functionality is present in a given lens by looking at the contacts on the back? Thanks in advance!

10-23-2010, 07:12 PM   #2
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Yup you can. If you look here you can see the entire coding for the contacts.
10-23-2010, 07:56 PM   #3
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More info about the K-mount then you ever need to know.

K-Mount Evolution, Features and Operation
10-23-2010, 08:51 PM   #4
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The earlier lenses had fewer contacts than the newer ones. See here:

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