What is the maximum focal length of a fiber optic collimator

Focusing of the collimator is adjustable for object distance between 50 mm and infinity. In practice, it is often convenient to do this with a fiber collimator (fiber-optic collimator). There are two different basic types of such devices, differing in how the. Pointing stability is within 15 mrad for 2. Non spherical lenses can be coated with anti reflective film layers: 400-700 nm, 650-1050 nm, 1050-1700 nm. [pdf]