Glossary
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Glossary
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ASL (Aspherical) Aspherical
ASL or Hybrid Aspherical lens is often found in Sigma and Tamron lens specs and is a special type of aspherical lens that is bonded onto a normal spherical lens. This is less expensive to manufacturer than aspherical lenses and allows a much more compact optical construction without the need for multiple elements - one reason why compact cameras can have such large focal length ranges these days.