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Nokia 808 PureView

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Nokia 808 PureView

The Nokia 808 PureView is a Symbian-powered smartphone by Nokia. It was first unveiled on 27 February 2012 at the Mobile World Congress (MWC) and released in May 2012. It is the first smartphone to feature Nokia PureView Pro 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 digital zoom. It was one of the most advanced camera phones at the time of its release.

The Nokia 808 PureView features a 41 MP 1/1.2 in (10.67 × 8 mm) sensor and a high-resolution f/2.4 Zeiss all-aspherical 1-group lens. The 808's sensor was the largest (over 4 times larger than typical compact cameras) sensor ever to be used in a cameraphone at the time of its launch, a record previously held by Nokia's N8 and, as of September 2014, by the Panasonic Lumix CM1.

The 808 PureView was the last Symbian smartphone from Nokia. In July 2013, Nokia released the Lumia 1020, a successor running the Windows Phone operating system common to Nokia's newer products.

As of 2024, despite larger 1" sensors and processing, modern phone cameras could not provide resolution better than the Nokia 808 PureView, at least in broad daylight.[unreliable source?]

PureView Pro is an imaging technology used in the Nokia 808 PureView device. It is the combination of a large 1/1.2 in, very high-resolution 41 MP 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 commonly used in other 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.

The Nokia 808 PureView has a 41.3 megapixel 1/1.2 in CMOS FSI image sensor with 7728×5368 pixels, built by Toshiba and branded HES9. Pixel size is 1.4 μm; sensor size is 10.67 × 8.00 mm.

Depending on the aspect ratio chosen by the user, the sensor will use a maximum of either 7728×4354 pixels (33.6 MP; full sensor width) for 16:9 images, or 7152×5368 pixels (38.4 MP; full sensor height) for 4:3 images when using the default camera software, although third-party apps exist that can capture the full resolution of the sensor. The output from the sensor is processed using the on-chip image processor, resulting in a lower-resolution final image with a default resolution of 5 MP through pixel binning (oversampling) from the full 34/38 MP image. The image processor highly reduces external processing needs and data rates as well as image noise (see noise shaping). The pixel binning was non-destructive, meaning the user could reframe the image or zoom in after the shot was taken.

Zoom is digital, meaning the image is cropped from a smaller portion of the image sensor, with a corresponding reduction in the level of pixel binning as the zoom is increased. In general, the camera of the Nokia 808 PureView retains a high resolution even when zoomed in, due to the 41 MP sensor. The limit of the zoom is reached when the selected output resolution becomes the same as the input resolution. That means once the area of the sensor reaches 3072×1728 (5 MP for the 16:9 aspect ratio), the zoom limit is reached. At default settings, maximum zoom is 3× for stills and 4× for video (1080p).

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