LBTEK 80 mm EFL achromatic large-aperture fiber collimator is designed for large beam diameters. To minimize losses caused by surface reflections, both sides of all lenses in the collimator are coated with broadband anti-reflection coatings. The anti-reflection coating wavelength ranges are: 400 - 650 nm, 650-1050 nm, and 1050-1650 nm. The red focus ring on the collimator can be adjusted to change the focus distance between infinity and the closest focus distance. The included 1.5 mm hex wrench can be used to tighten the set screw on the side of the housing to lock the focus ring for improved stability. During focusing, only the focus ring rotates, and the rest of the components remain unaffected.