How to build an autocollimator

This video describes how to build a powerful alignment and metrology tool for your optical lab. It provides an accurate reference of infinity (collimated) light and allows to measure very small angles of reflective or semi-reflective (e.g. air-glass) interfaces. Autocollimators are real time-savers in optical labs!If you would like to have more information on autocollimators and angle measurement, please consult these two posts on our website: - "A Reference of Optical Infinity" (text version of video) : http://www.thepulsar.be/article/a-reference-of-optical-infinity/ - "Measuring Small Angles Deviations" : http://www.thepulsar.be/article/measuring-small-angles-deviationsI hope you will enjoy the video! Do not hesitate to comment!