Specification
Material: aluminium alloy
Extend Parfocus: 12 mm, or 15 mm, or 18 mm, or 28 mm
Total Length: 16 mm, or 19 mm, or 22 mm, or 32 mm
Out Thread of the Top: RMS
Inner Thread of the Bottom: RMS
The Length of the male thread: 4 mm
This item can be used to match a variety of different parfocal lengths, can extend the parfocal length by 12 mm or 15 mm or 18 mm or 28 mm.
Package Included
1x extension ring adapter