Set automatic extension rings for Canon EOS EF / AF - * 3 rooms: 13 mm, 21 mm, 31 mm * Bayonet - for Canon EOS 1D C Canon EOS 1D X 1D Mark I-IV I-1Ds Mark III, I-5D Mark III, 7D 60D 50D 40D 6D 30D 20D 10D 650D 600D 1100D 1000D 550D 500D (Electronics) 5
Set automatic extension rings for Canon EOS EF / AF - * 3 rooms: 13 mm, 21 mm, 31 mm * Bayonet - for Canon EOS 1D C Canon EOS 1D X 1D Mark I-IV I-1Ds Mark III, I-5D Mark III, 7D 60D 50D 40D 6D 30D 20D 10D 650D 600D 1100D 1000D 550D 500D (Electronics)
Does exactly what it is supposed to do: extend the focal length while maintaining active connections. The build quality is excellent. It's great.
I used before, the product of the same kind but without connections (found at 10-12 euros and whose rings are screwed) - this is the day and night! Do not hesitate to choose this one!