Focus position encoders for optical fiber inspection device

An opto-mechanical assembly of a microscope system for testing an end face of an optical fiber, comprising:

• an imaging device configured to capture an image of an end face of an optical fiber;
• a focus assembly comprising a system of lenses configured to focus the image of the end face of the optical fiber for capture by the imaging device;
• and
• at least one focus position encoder associated with the focus assembly and configured to determine at least one focus position measurement associated with a position of at least one lens of the system of lenses.

A method, comprising:

• obtaining, from at least one focus position encoder associated with a focus assembly disposed in an opto-mechanical assembly of an imaging device, at least one focus position measurement associated with a position of at least one lens of a system of lenses of the focus assembly;
• determining, based on the at least one focus position measurement, a magnification value associated with the focus assembly;
• performing, based on the magnification value, a test to inspect am image of an end face of an optical fiber for compliance with a set of criteria related to a condition of the end face of the optical fiber, wherein at least one testing parameter is based on the magnification value;
• and
• outputting a result of the test that indicates a compliance status associated with the set of criteria.