I tried to use a Metabones IV with Sony A7RII and Canon EF lenses and several lenses don't work like other users describe. See my email communication with Metabones below. They confirm: 0.41 does not work properly with A7RII, they recommend to downgrade to 0.39 and they work on a version that would work properly.
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Dear Christoph,
As advised by Technical team, the existing firmware is not stable with Sony A7r II and EF Lenses.
They are working on a new firmware for A7R II now. Will you consider to downgrade to V0.39 before the new firmware be ready?
The EF Mark IV adapter can’t support CY-EF adapter or other add-on adapter, they may “short circuit” between adapter and contact pins.
Regards
Elsie
GBI Ltd
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Dear Elsie!
1. Your current firmware for Metabones IV is 0.41 and this is pre-sinstalled. Why you suggest to downgrade to 0.39? How to get 0.39? I don’t see a download possibiity for 0.39 on the metabones website.
2. Why your engineers don’t have a test report for using TSE lenses? The Canon 17TSE and 24TSE lenses are very popular among architecture and interior design photographers to use with Metabones adapter on Sony A7 cameras so Metabones should test well and especially take care of good compatibility of these lenses with your adapters.
3. Sony HK reports to us that other users have similar contact/shut-off issues using Canon lenses via Metabones IV with A7R-II camera and that they are in contact with you solving these issues. Good luck!
4. I used today a Contax CY lens via a Contax CY - Canon EF Adapter with Metabones IV and A7R-II and several times the camera did not allow me to release the shutter because the Metabones transmits a status information to the camera which prevents a shutter release.
If I connect the Contax CY lens via a mechanical adapter directly to the A7R-II there is no problem to release the shutter, so this phenomenon is a Metabones issue. What to do?
Please keep us updated with your findings and an eventual firmware update.
Thanks for your efforts,
Christoph
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Dear Christoph,
As advised by engineer, we have no test report for the TSE lenses, and advise for downloading the firmware to V0.39.
Please feel free to contact us if you need further information and assistance.
Regards
Elsie
GBI Ltd
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Dear team Metabones,
me and a friend recently aquired at Sony Hong Kong store two Sony A7RII camera bodys plus two Metabones IV Sony FE - Canon EF adapters.
The adapters came with latest firmware 0.41 (I checked in camera menu).
Mostly the adapters work fine but we both face the problem that frequently it looses the electronic connection to the Canon lens (TSE 17 or TSE 24), this means it is no longer possible to adjust and close the aperture for the exposure.
One has to release and turn the lens to re-connect or switch off/switch on the camera. Both is annoying.
My guesses for root cause:
1. firmware not stable with Sony A7RII > brakes down and needs reset
2. connection contacts between adapter and camera or spring loaded connection between adapter and lens not in perfect correct postion/are not able to provide perfect electrical contact. (maybe less probable reason)
Your experience?
Your suggestion how to deal with this problem?
I tried to download the firmware again via your link
http://www.metabones.com/download/of/MetabonesAppV1.7.dmgbut it is impossble.
Please send me the latest firmware by email.
Thanks,
Christoph