Pentax Automatic Extension Tube set
eBay item 154475347142
Condition: Used
Vintage automatic extension tube 3-ring set for Asahi Pentax, Praktica,
Ediza, Mamiya Sekor, Yashica TL, Ricoh, Argus, Regula, Chinonflex, etc.
In great shape with box.
received 26 Aug 2022
These M42 extension tubes have unusually small knurling and fit in Nikon UW trinocular port.