| http://www.w3.org/ns/prov#value | - For this reason, mechanical structures become complicated, which are used for a certain optical system to move lens groups along the axial direction for focusing and zooming purposes. [0004] Since motors, etc. are used to mechanically move some of the lens groups, there are problems such as increased power consumptions, noisy sounds, slow responses, and time-consuming movement of lens groups.
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