I Bite.. dont bite how to eat?.. but I can bite with my false teeth and talk at the same time...
Bro Akerue, you used bellow attachement before? and with what lens?.. reverse mount?
Dro DD?.. same question
Bro, found a site to answer your questions...
http://www.macrobellows.com/
Basically it is an adjustable extension ring/tube.