This standard applies to threaded parts and screws (hereinafter referred to as objective screws) of microscope objectives, revolvers, etc. However, this does not apply to special objective lenses.
JIS B 7141:2003 history
2012JIS B 7141:2012 Microscopes.Screw threads for objectives and related nosepieces
2003JIS B 7141:2003 Microscope -- Screw thread for objectives
1994JIS B 7141:1994 Microscope -- Screw thread for objectives