Those contacts on the back of a lens

whitelotus9 · 10-23-2010, 07:07 PM

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!

omega leader · 10-23-2010, 07:12 PM

Yup you can. If you look here http://www.robertstech.com/matrix.htm you can see the entire coding for the contacts.

**boriscleto** · 10-23-2010, 07:56 PM

More info about the K-mount then you ever need to know.

K-Mount Evolution, Features and Operation

Adam · 10-23-2010, 08:51 PM

The earlier lenses had fewer contacts than the newer ones. See here: https://www.pentaxforums.com/forums/pentax-lens-articles/87589-photos-k-m42-m...-k-mounts.html

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)

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10-23-2010, 07:07 PM	#1
whitelotus9 Senior Member Join Date: Oct 2010 Location: Kissimmee, Florida, USA Photos: Gallery Posts: 148	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
omega leader Veteran Member Join Date: Jan 2008 Location: Niagara Region, Ontario Canada Photos: Gallery Posts: 417	Yup Yup you can. If you look here http://www.robertstech.com/matrix.htm you can see the entire coding for the contacts.

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10-23-2010, 07:56 PM	#3
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	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
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	The earlier lenses had fewer contacts than the newer ones. See here: https://www.pentaxforums.com/forums/pentax-lens-articles/87589-photos-k-m42-m...-k-mounts.html Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers: