Andoer Colorful metal TTL AF Auto Focus Macro Extension Tubes Automatic Extension Tubes for Canon EOS EF EF-S-60D 7D 5D II 550D (Silver) (Electronics) 4
The intermediate rings fulfill your task to the complete satisfaction. Transmission of signals work properly. Only in the attachment and detachment of the bayonet, it crunches a little. But if you like I want to do even a few macro shots only every now and then the rings are absolutely fine.