Vello Extension Tube Set for Canon EF flash with a convenient clamshell design

with a convenient clamshell design that slips easily in and out of a pocket

Connects to your flash with a pc sync cable (not included) and sticks to smooth surfaces with its built-in suction cup- just place it in line of sight of your main flash within 50 feet

smooth focusing

while the back's serial number is 548

Vello Extension Tube Set for Canon EF flash with a convenient clamshell designA set of three extension tubes for Canon EF mount: 13mm, 21mm, and 31mm. These tubes have the electronic contacts necessary to maintain autofocus and autoexposure capabilities. If you're curious about dabbling in macro work, this is an inexpensive way to get started.