A: This issue may be caused by misalignment between the eyepiece and the objective lens. Please calibrate the optical system to ensure coaxial alignment. Also check for improper diopter adjustment (not adapted to the user’s vision), lens contamination (e.g., fingerprints, dust), or internal fogging. Clean the lenses using professional optical cleaning tools, and avoid directly spraying alcohol onto the lens.

A: Use an ultra-fine microfiber cloth to avoid scratching or damaging the lens. Do not expose the eyepiece to strong light (e.g., direct sunlight) for extended periods to prevent internal adhesive layer aging.