I have purchased a A7R and find it a good compact camera with some limitations.
I use the metabones EF mkIII adapter and after covering the interior with felt, I have no issues with reflections.
That being said, I did not shoot much with it before covering with felt.
Check
here for a template I made from Marc Aurel's sketch to make the felt process easier,
My experience so far is that with quality lenses, such as the TSE24II or CZ55/1.8, I am achieving an high level of detail and low shadow noise that was simply not achievable with my current camera bodies (5D3, 6D). Ofcourse the detail is not the same as the IQ180 I used to own, but at the price and dynamic range that exceeds the IQ180, it is a very good compromise. I can stitch easily to generate MF resolutions.
I have not had issues with shutter vibration so far, this may be chance or my technique/equipment are minimizing the effect. I have been shooting up to 100mm lenses but mounting the body to the tripod, not using the adapter foot or lens plates. Hand held I have tack sharp images with the EF300/2.8IS, even below 1/300th of a second. The large lens mass and holding technique probably reduces any blur.
Some of the limitations I have found are:
- There is no live RGB histogram like on my canon bodies. I have not shot enough to know how much headroom I have before clipping channels with the zebras. The luminosity histogram is a copy of the green channel. So To confirm I have not clipped a blue or red channel, I have to check the image playback RGB histogram.
- High ISO quality is not that great compared to my 6D. There is detail smearing. This is not a big deal for me as I am 90% of the time a base ISO shooter.
- Using the camera on the tripod, it is so small that when trying to adjust settings, the viewfinder detection will trigger the LCD display to turn off. I can set the camera to turn off the viewfinder, but I can not set this function as a custom function. I can with disabling the LCD monitor. Annoying I can not toggle it with a custom programmed button. (if anyone knows how to, please let me know)
For me, it is a great compact camera for landscape use with my current canon lenses with out having to buy a D800 + Nikon Glass.
It takes up barely any room in my pack when I am using the 5D3 for anything that I need auto-focus for and the 6D I use for any astro-long exposure stuff.
Hope this aids people with there decisions.
Cheers
Dave