Funny, isn't it?
E-Mount also has same flange distance. Something tells me that it is not random :-)
Wow, that is some spec
http://pro.sony.com/bbsc/ssr/show-highend/resource.solutions.bbsccms-assets-show-highend-F5.shtml
PDF - http://pro.sony.com/bbsccms/assets/files/show/highend/pdf/F5_Camera.pdf
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