Metabone Speedbooster w/ M42?

[imdennfool]

Just out of my curiosity,
Does anyone have any experience mounting M42 lenses on Metabone Speedbooster EF - NEX? (M42-EF TO EF-NEX)
Based on Metabone's website, it stated "not advisable". As I know M42 lenses have a protruding flange when focus at infinity.
I did some research on the internet, but I don't see anyone is doing it.
Any hints?

 

[one eye jack]

Just out of my curiosity,
Does anyone have any experience mounting M42 lenses on Metabone Speedbooster EF - NEX? (M42-EF TO EF-NEX)
Based on Metabone's website, it stated "not advisable". As I know M42 lenses have a protruding flange when focus at infinity.
I did some research on the internet, but I don't see anyone is doing it.
Any hints?

Use at your own risk..that said someone has done it back in 2013. Taped off the electrical contacts?

Metabones speedbooster + M42 SMC takumar 50mm f/1.4 + nex (2013)
https://www.dpreview.com/forums/thread/3387624

http://www.metabones.com/article/of/faq

metabones products
http://www.metabones.com/products/?c=speed-booster

PS metabones is designed for video so lens mount is tighter than native mounts which can cause
electrical contact problems resulting in blank screen.see dp review link. There are work arounds..
use dumb adapter or if chipped adapter firmware is not compatible replace or change the chip.