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Re: [OM] Micro four thirds lens contacts

Subject: Re: [OM] Micro four thirds lens contacts
From: Moose <olymoose@xxxxxxxxx>
Date: Tue, 18 Jun 2019 15:11:24 -0700
On 6/18/2019 1:57 PM, Jan Steinman wrote:
From: Mike Bloor <admin@xxxxxxxxxx>

I'm sure it's been discussed here before, but can anyone point me to
a description of what the electrical contacts on the micro 4/3 mount do?
I don't think it's disclosed, unless you are a micro-four-thirds consortium 
member, which costs big bux.

I have a link somewhere to some guy who hooked a logic analyzer up to the pins 
and did a bit of reverse-engineering, but it hasn't been updated in years.

Even if one knows what they all are for, some part is a serial comm interface. The processor in the camera talks to the one in the lens Unless one knows the "language", there's no point.

So, MikeB, what are you trying to do? In the link Piers posted, the fellow is clueless "you could monitor the signals, for focus etc. Then you'd be able to add an external potentiometer and let the Arduino send the focus signals."

"So now you could have a relatively inexpensive electronic, or even wireless follow focus on any of you auto focus lenses." I'm not sure what he's getting at; how would the Arduino know the distance to the subject? These cameras don't focus by subject distance anyway, They know the ~distance, but that's post focus.

My cameras do C-AF internally, anyway. Or might he be talking video focus 

Serial Moose

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