Werner,
Got in touch with the Hong Kong people about Techart Pro. It seems they are very fast in responding to potential customers. Here is the response:
Hi Henry,
Sorry that the adapter cannot be used with A7R.
Kevin
I also contacted the producer and this is what I received in return:
Hello Sir,
Sorry, we temporarily don't have Techart adapter for Contax Zeiss C/Y lenses to work on Sony A7R now. But I will let you know if we have it in stock in the future.
Thank you.
I am sending this inormation for other photographers interesting in acquiring Teacart Pro who use A7R like me.
Cheers,
Henryk