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)
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