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This holder fit in Canon extension tube and hold the PiDOF adapter in position
1. Canon extension tube (5 pieces--lens mount, body mount and 3 extension tubes 9, 16, 30, internal dia 57mm)
2. Focus Screen EG-a for EOS 5D
3. Raspberry Pi Camera module
4. PiDOF adapter
5. PiDOF adapter holder for canon (this one)