Mamiya extension tubes are precision machined for close-up and macrophotography. They are fully meter coupled for automatic or manual exposure. The two automatic tubes can be used individually or in combination.
No 1 = 45mm extension
No. 2 = 82mm extension
No. 1 + 2 = 127mm extension
Since the camera body bellows features an extension of 46mm, using the tubes provides a total maximum extension of 173mm.