"This is one of the Pro-series lens mount adapter made with precision and pristine award standard. As all Pro-series adapters, these adapters have been specially crafted to endure professional lenses....
AdvantagesHigh quality, compatible with the same brand of lenses.
DisadvantagesThere are cheaper unbranded alternatives.
AdvantagesGood quality item, Canon branded, good fitting.
AdvantagesAffordable, could save you a fortune, branded to match your camera.