High-Precision Knob-Focus Collimator, it is suitable for collimating the output light of optical fibers or coupling spatial light into optical fibers. Through strict control of machining tolerances and the design of a special internal structure, excellent coaxiality is maintained throughout the focal length adjustment process. The adjustment knob adopts a fine-thread design, which balances a lightweight operating feel with high adjustment precision. This product features excellent long-term stability-no significant internal stress is generated when the ambient temperature changes, and the coupling efficiency can be maintained at a high level. High-quality lenses ensure the Gaussian beam profile of the output light and reliable coupling efficiency.