Disclosed is an objective lens for a DVD/CD compatible optical pickup, which improves optical efficiency while minimizing aberration occurring due to different disc thicknesses of different optical storage media. The objective lens has first and second aspherical lens surfaces.

 
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< Lens barrel having cam-cylinder with cam-groove and varying wall thickness, lens barrel having guide-cylinder with varying wall thickness, and lens barrel having the cam-cylinder and the guide-cylinder

< Hybrid lens and projection optical system including the same

> Lens system and optical device having the same

> Advanced compact head up display
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