comparing telecentric vs entocentric optics for extensometers - Epsilon Technology

This video shows how a telecentric lens nearly eliminates extensometer measurement errors from out-of-plane movements that are typical with specimens that are not straight. For example, tensile specimens made from metal strip that was coiled may have some curvature.
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This video features the image “Bi telecentric lens Schneider” by Laserlicht, available under CC BY-SA 4.0 license.