The Nokia 808 PureView is a Nokia Belle powered smartphone, first unveiled on 27 February 2012 at the Mobile World Congress. It is the first smartphone to feature Nokia's PureView technology, a pixel oversampling technique that reduces an image taken at full resolution into a lower resolution picture, thus achieving higher definition and light sensitivity, and enables lossless zoom.
It features a 41 megapixel 1/1.2" sensor and a high resolution f/2.4 Zeiss all-aspherical 1-group lens. The 808's sensor was the largest and highest resolution sensor in a cameraphone at the time of its launch, a record previously held by Nokia's N8, sporting a sensor 2.5 times larger than that of its predecessor.
The 808 won the award for "Best New Mobile Handset, Device or Tablet" at Mobile World Congress 2012, and the award for Best Imaging Innovation for 2012 from the Technical Image Press Association.
Pure view Pro camera
PureView Pro is an imaging technology used in the Nokia 808 PureView device. It is the combination of a 1/1.2" large,very high resolution 41Mpix image sensor with high performance Carl Zeiss optics. The large sensor enables pixel oversampling, which means the combination of many sensor pixels into one image pixel. PureView imaging technology delivers high image quality, lossless zoom, and improved low light performance (see below). It dispenses with the usual scaling/interpolation model of digital zoom used in virtually all smartphones, as well as optical zoom used in most digital cameras, where a series of lens elements moves back and forth to vary the magnification and field of view. In both video and stills, this technique provides greater zoom levels as the output picture size reduces, enabling 4x zoom in full HD 1080p video, 6x lossless zoom for 720p HD, and 12x zoom for nHD (640x360) video.
Pure View Pro specifications
Sensor: 41 megapixel CMOS image sensor, 1/1.2" image sensor format with 7728 x 5368 pixels, pixel size: 1.4 microns.
Lens: Carl Zeiss optics with F-number: f/2.4. Focal length: 8.02mm: 35mm equivalent focal length: 26mm @ 16:9 and 28mm @ 4:3. Construction: 5 elements in 1 group. All lens surfaces are aspherical, partly extreme aspheric, one high refractive index, low-dispersion glass mould lens.
Focus range: 15 cm – Infinity (throughout the zoom range).
Shutter: Mechanical shutter with short shutter lag and ND8 (3 f-stops) neutral density filter
Processing: On-chip image processor performing image scaling with oversampling, giving lossless (digital) zoom: 4x for full HD 1080p video with on-chip video processor performing image resolution processing with over 1 billion pixels per second enabling the use of all pixels for improved image noise and dynamic range .
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