Has anyone used a Canon EF25 II Extension Tube - Canon EF25 II Extension Tube (9199A001AA) - Wex Photographic
On a Canon EF 100mm f2.8 USM Macro Lens - Canon EF 100mm f2.8 USM Macro Lens (4657A011AA) - Wex Photographic
And if so - what sort of results did you get ?