Focusing Lens: Position the biconvex lens above and the meniscus lens below. A mildly convex surface should be paired with the meniscus lens. Collimating Lens: Place the meniscus lens above and the biconvex lens below. A mildly convex surface is to be matched with the meniscus lens. **Lens Characteristics** High Transmittance and Low Loss Utilizing high - grade substrates and state - of - the - art coating techniques, light loss is significantly minimized. The transmittance rate exceeds 99.5%, thereby enhancing operational efficiency.