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.
Image sensor 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; 5 all-
aspherical lens elements are used, making it possible to increase border-sharpness and lower
distortion and
astigmatism. The high–
refractive index, low-
dispersion glass additionally helps reduce
chromatic aberrations. A
neutral density filter with approximately
ND8 (3
f-stops) is employed for shooting in high light levels where normally a smaller aperture would be set. Although the lens is named a
Tessar, it has almost nothing in common with the 4 element in 3 group, non-aspherical original Tessar. Due to the comparatively large 1/1.2 in sensor and the comparatively
fast lens with f/2.4 aperture, the camera has a quite
shallow depth of field, equivalent to approximately f/7.8 at 26 mm on 35 mm
full-frame.
Shutter The 808 PureView has a
mechanical shutter with short shutter lag and
ND8 (3
f-stops)
neutral density filter.
Audio The 808 PureView employs
Dolby Headphone software to transform stereo content to surround via a 3.5 mm A/V jack. It also includes Dolby Digital Plus software to provide 5.1 surround sound via HDMI or DLNA. The dual software elements from Dolby are embedded into the Nokia Belle feature pack 1 OS. The 808 PureView is the first device to include the Nokia Rich Recording technology and has a frequency range between 25 Hz to around 19 kHz. The 808 PureView can capture sounds at the loudness level of up to 145 decibels without distortion. The two microphones, located at the top and the bottom enable ambient stereo recording. The audio encoding is done in AAC high profile, 256 kbit/s, 48000 Hz. == Reception ==