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The lens are high grade Nikon / Nikkor glass. They make the best lens and they are completely optical for the DSLR systems. The sensor is a 23.1 x 15.4 mm CMOS sensor, with 14.8 million pixels.
Sorry, there was a problem. Please try again later.Lens is glass and the zoom is optical on all Nikon DSLR cameras. Image Sensor Type is CMOS. For fill tech specs please see: http://www.nikonusa.com/Nikon-Products/Product/Digital-SLR-Cameras/25472/D3100.html#tab-ProductDetail.ProductTabs.TechSpecs
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