(under subclass 503) Subject matter including a sliding structure, a bellows, or a telescoping structure for adjusting an optical barrel along the optical axis relative to another structure.
(1) Note. Other subclasses in this class indented under subclass 362, Compound lens system and titled "Separation of optical elements axially adjustable", "Variable magnification" or including the word "focusing" may include subject matter related to subject matter in this subclass.
