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zoom lens
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zoom lens

Photographic lens that, by variation of focal length, allows speedy transition from long shots to close-ups.



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TT83 TA1570 For some 50 years, Mann has worked in the design and analysis of optical systems, including visual and infrared zoom lenses.
The problem with zoom lenses is that they are never as high quality as fixed focal lenses.
The retractable zoom lenses can be extended whenever the camera is switched on and retracts whenever it is shut off.
 
 
 
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