E-mount reverse engineering

Started Jul 12, 2015 | Discussions thread
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Entropy512 Veteran Member • Posts: 5,819
E-mount reverse engineering

I'm curious:

The Canon EF mount pinout AND the protocols has been pretty well reverse-engineered and documented. https://pickandplace.wordpress.com/2011/10/05/canon-ef-s-protocol-and-electronic-follow-focus/ for example

Similarly, there's been some decent progress made on FT/MFT - http://preamp.org/revenge/four-thirds-communication-protocol and http://marcuswolschon.blogspot.com/2013/12/reverse-engineering-micro-four-thirds.html

With the popularity of Sony's E mount, why hasn't anything like this been done yet? Is anyone aware of any reverse engineering efforts underway?  I can't find anything.

I decided to at least start on this using a DMM, my A6000, SEL55210, and a Viltrox EF-NEX II.

Initial progress at https://plus.google.com/u/0/+AndrewDodd/posts/2bK7y6PhGHQ

Discoveries so far:

Pins 1 and 3 are GND.  These are shorted together by every piece of E-mount equipment I've looked at so far, including the A6000 body itself

Pin 10 appears to be Lens Detect - With no lens attached, this has approximately 2.8 volts on it from the A6000 body but no other pins have any voltage.  The EF-NEX II grounds this through a 680 ohm resistor, SEL55210 ties this to ground with a dead short.  (Possible detection of adapter vs. native lens?  Does anyone have an ohmmeter and an LA-EAn?)

I have not identified the other pin functions yet as the camera does not appear to turn on lens power until a lens is detected.  (Good design decision there...)  I don't have enough hands to short 1 and 10 together AND probe pins on the body at the same time. 

 Entropy512's gear list:Entropy512's gear list
Sony a6000 Pentax K-5 Pentax K-01 Sony a6300 Canon EF 85mm F1.8 USM +5 more
Sony a6000
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