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Sony A7S Metabones Compatibility Issues with Sigma glass


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So my A7S and Metabones Canon EF Lens to Sony NEX Smart Adapter (Mark IV)†works great with:

  • Canon 50mm f/1.8 II EF
  • Sigma 24-105mm F/4 DG OS HSM Lens for Canon DSLR
But not with:
 
Sigma 24-70mm f/2.8 IF EX DG HSM f/CANON
... works for 5-25 minutes then stops working, frequently crashes, works again for 2-10 mins then crashes again
 
Sigma 50mm f/1.4 EX DG HSM Autofocus Lens for Canon SLR
... works for 5-25 minutes then stops working, frequently crashes, works again for 2-10 mins then crashes again
 
I wrote to Metabones support about this issue but got this response:
 

 

Are you trying to set your adapter to advance mode when using those two Lens?

 

Turn on camera first, and then install Lens to adapter, then install adapter on camera and hold the side button as the same time…..

 

Pls try again…..

 

Thank you!

 

Alex

 

 

What is this advance mode?
 
When I swap out a lens on the A7S, I simply switch off the camera.  Install the new lens.  Then switch on the camera.  I always keep the Metabones on the camera, never take it off.  I also never use the button on the side of the Metabones adapter.  Maybe I pressed it once a few weeks ago.
 

I use my A7S exclusively for film making, Manual focus only - never auto-focus.  

 

Any advice would be hugely appreciated.

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I have found that quite a few sigma lenses don't work properly with the Metabones IV for Canon glass. I even tried using the latest Dec 29th firmware and still no go.

Here is a List that I found doesn't work properly and crashes intermittantly:

Sigma 50mm 1.4

Sigma 35mm 1.4

Sigma 120-300mm last 2 versions (Older Sigma 120-300 works)

 

Did you get any more information from Metabones about this?

 

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the pins on the metabones adaptors are too long and short circuit on a lot of lenses.  The particular short seems to affect the way the metabones adaptors communicate with the camera.  use a bit of pvc electrical insulation tape over the back of the lens to stop the electrical contact being made.

 

 

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