A reduction optical system for forming, without re-imaging, a reduced image of a subject image formed by a main lens system. The reduction optical system has on the most object side a meniscus single-lens element convex to the object side, allowing for a high-performance, and compact reduction optical system by permitting lens replacement of the main lens system.

 
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< Methods and systems for automatic identification of device accessories, and devices configured to automatically identify attached accessories

> Image-capturing device having multiple optical systems

> Autofocusing still and video images
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