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Lens Protocol

Mr Cheng,

I was wondering if you know of anyone who has made public the Canon Lens protocol. I'm working on a small project and wanted to drive a Canon lens without the camera body. Love your website, and plan on ordering your book!

Thank You,

Wed, 14 Oct 2009 18:05:20 +0000

Yes, I could use this too, is this in your book?

Wed, 21 Oct 2009 13:31:20 +0000

The Canon EF lens protocol is a private interface. And so far, no one has publicly published the protocol from reverse-engineering it. Companies and people who have reverse-engineered it are selling the specification commercially.

Chieh Cheng
Wed, 21 Oct 2009 21:17:50 +0000

Can you or anyone share the name of a company or person that is selling the spec?

Wed, 28 Oct 2009 13:54:27 +0000

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