I have yet to put my A7R with metabones Canon EF III adapter through its paces yet.
Here are some things I have noticed about both the camera and the adapter
Metabones Canon EF III Adapter
1. My adapter bore diameter was so tight, that I had to take the lens mount off the adapter and sand the chrome plating off the brass to increase the bore diameter. Once I had done this, I was able to fit Canon lenses with out forcing them on and having fear that I would break the lens mount trying to get the adapter off the lens. This tight fit was not due to the springs as it mentioned on the Metabones website.
2. The button on the adapter, that I had assumed to be DOF preview is actually the reverse! If a camera has stopped the lens down, pressing the button apparently makes it wide open. Not so useful for my photography.
Sony A7R
1. As previously mentioned, no first curtain shutter. I am yet to test to see if this will be a true issue for the focal lengths and shutters speeds I typically shoot at.
If there was the ability in Manual mode, to disable the full time live view, then this would reduce the close/open shutter vibration if the sensor /hardware design can not allow for a firmware update for electronic first curtain shutter.
2. No real time RGB histogram, only a luminosity histogram that appears to be just a copy of the green channel.
During image playback, you can get a split LRGB histogram and it appears that L=G channel.
I have not yet tested if the zebras are based on the first channel to clip or this luminosity channel. I fear the luminosity channel.
3. No DOF preview button.
Without this feature, using my TSE24 is difficult to set the plane of focus to maximise DOF.
I tried a walk around which involved the following:
- Take a long shutter speed shot at the desired aperture
- Mid shot decouple the lens and adapter pins by rotating the lens on the mount.
Be careful not to rotate too much and have your lens fall off. (red dot is near the EF-S white dot)
This will leave the lens stopped down
- Use the TSE rotation axis to rotate the tilt plane to the desired tilt axis (one detent stop)
- Set your plane of focus and if happy, securely mount the lens and rotate back to the proper position.
As I said I have not tested the kit out properly yet, just in my lounge room last night after modifying the adapter.
Over the Christmas break I will get and use it for landscape work and report back anything else I notice
Regards
David