Sony Multi Interface Shoe Adapter

To use the HVL- F56AM on the Sony A77 II, you will need the Sony Multi-Interface Adapter. In a similar adapter that is available, please the link: http://bhpho.to/1bswaX8

This adapter is not compatible with the Sony a6000 and a Canon 430EX flash. There is not a way to get TTL metering with a Canon flash on a Sony camera.

Yes

The Sony HVL-F60M has the Multi-Interface Shoe and will not require the use of an adapter to be used with the Sony A7.

Yes, the Sony Multi Interface Shoe Adapter is compatible with the Sony a7R IIIA Mirrorless Camera.

This adapter does expand accessory compatibility by allowing use of older Sony Alpha accessories such as viewfinders and flashes. However you will need to test out the product to see if all of the functionality comes over and your results may vary from product to product.

I have HVL-F58AM flash I used with my A77. I bought this adapter so I can use it with A7RIII. Works perfectly on camera and with good results when flash is needed.

Both the a7R and 580EX have a standard shoe design, so you wouldnt need a hot shoe adapter to mount the flash onto the camera. That being said, while the a7R might be able to fire the 580EX, there will be no auto functions.