At first there were small problems with the attachment of the intermediate rings on my camera! On a Nikon D5100 rings snap not by itself. I then contacted de seller. He answered quickly and shrieb in an email with photos as I still bring the rings to snap and I therefore can not use it! So very customer friendly! The rings on sch I will test the next day extensively, but so far I am therefore very zufreiden with my purchase! :-)