Promaster Extension Tube Set for Canon EF flash meter Features a large lens lineup

Features a large lens lineup and system accessories as well

which might be handy if remotely firing EL-style cameras is what you need to do

This SF-1N is in excellent condition

with some minor paint wear and patina on leather surfaces

Epson to the rescue with the P-3000

Promaster Extension Tube Set for Canon EF flash meter Features a large lens lineupA set of three extension tubes for Canon EF mount: 12mm, 20mm, and 36mm. 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. Includes front and rear caps.