The BOCI BLT 421 is a high-precision collimating lens designed for optical applications requiring focused and parallel light beams. Featuring an F100 focal length, this lens ensures optimal collimation performance. The lens comes pre-mounted in a durable holder, providing easy installation and stable alignment in various optical systems. Ideal for use in laser setups, fiber optics, and other precision instrumentation, the BLT 421 offers reliable and consistent optical quality.