Compound lenses --- what's the purpose? Correct bad optics with additional optics --- Hubble telescope, eyeglasses, etc. Correct or minimize aberations: - ppt download
Physics - Optics 2 (6 of 15) Compound Thin Lenses: An Example - YouTube
Lens - Wikipedia
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Introduction
Canon develops new camera-lens optical element that enables exceptionally high levels of chromatic aberration correction | Canon Global