Nokia 1020 A00014540 Manual De Usuario
Los códigos de productos
A00014540
high resolution zoom
In addition to oversampling, the large sensor also allows
for high resolution zoom. As you zoom there is no drop
in the default 5MP resolution; in other words the high
resolution zoom is lossless. The level of pixel oversam-
pling is highest when you’re not using the zoom. It grad-
ually decreases until you hit maximum zoom where the
pixels start behaving in a more conventional way. The
relationship between zoom level and oversampling is
shown in Figure 5.
for high resolution zoom. As you zoom there is no drop
in the default 5MP resolution; in other words the high
resolution zoom is lossless. The level of pixel oversam-
pling is highest when you’re not using the zoom. It grad-
ually decreases until you hit maximum zoom where the
pixels start behaving in a more conventional way. The
relationship between zoom level and oversampling is
shown in Figure 5.
At maximum zoom, the Lumia 1020 system behaves
more like a traditional camera, but there are still some
advantages: as only the center part of the optics is
used, the optical and geometric distortions are minimal
and vignetting is negligible.
more like a traditional camera, but there are still some
advantages: as only the center part of the optics is
used, the optical and geometric distortions are minimal
and vignetting is negligible.
The problem with traditional digital zoom is that the
zoom level is extremely limited without clearly visible
loss of image details. This happens because the system
needs to zoom further than the required output resolu-
tion of the final image, and the camera needs to upscale
the captured image to achieve that resolution. In prac-
tice this means that, for example, a 12MP device might
capture only 4MP after zooming, and the 4MP image is
then digitally up-scaled back to 12MP. This up-scaling
has a significant impact on image sharpness. However
with Nokia Lumia 1020 we never need to upscale the fi-
nal images, because the starting resolution is already so
massive. In Full HD video mode the massive resolution
means that the camera never zooms further than the
required two megapixels, which ensures that the resolu-
tion stays excellent throughout the zoom range.
zoom level is extremely limited without clearly visible
loss of image details. This happens because the system
needs to zoom further than the required output resolu-
tion of the final image, and the camera needs to upscale
the captured image to achieve that resolution. In prac-
tice this means that, for example, a 12MP device might
capture only 4MP after zooming, and the 4MP image is
then digitally up-scaled back to 12MP. This up-scaling
has a significant impact on image sharpness. However
with Nokia Lumia 1020 we never need to upscale the fi-
nal images, because the starting resolution is already so
massive. In Full HD video mode the massive resolution
means that the camera never zooms further than the
required two megapixels, which ensures that the resolu-
tion stays excellent throughout the zoom range.
The advanced PureView method of lossless zooming also
provides multiple benefits over traditional optical zoom.
Traditionally the aperture of optical zoom systems be-
comes significantly smaller towards the long end of the
zoom range compared to the wide end. This has a big
impact on low light performance and usable exposure
provides multiple benefits over traditional optical zoom.
Traditionally the aperture of optical zoom systems be-
comes significantly smaller towards the long end of the
zoom range compared to the wide end. This has a big
impact on low light performance and usable exposure
times. Also with traditional zoom lenses the macro dis-
tance often changes while zooming, which means that
the photographer needs to change the physical cam-
era-to-object distance while zooming for macro shots.
In addition, most optical zoom lenses suffer from overall
reduced sharpness towards the long end of the zoom
range; this is because of optical design issues that of-
ten produce different distortions at the wide angle end
compared to those at the telephoto end of the zoom
range, which in the case of Full HD is up to 4X. See Fig-
ure 6 for a visual on the maximum high resolution zoom
for 5MP (3X) and 720P video (6X) compared with the full
resolution sensor in 16:9 and 4:3 aspect ratios.
tance often changes while zooming, which means that
the photographer needs to change the physical cam-
era-to-object distance while zooming for macro shots.
In addition, most optical zoom lenses suffer from overall
reduced sharpness towards the long end of the zoom
range; this is because of optical design issues that of-
ten produce different distortions at the wide angle end
compared to those at the telephoto end of the zoom
range, which in the case of Full HD is up to 4X. See Fig-
ure 6 for a visual on the maximum high resolution zoom
for 5MP (3X) and 720P video (6X) compared with the full
resolution sensor in 16:9 and 4:3 aspect ratios.
However with Nokia Lumia 1020, the aperture stays at
a constant f2.2 throughout the zoom range which is,
in SLR terms, 25/27-69/74mm (16:9/4:3) for stills and
25-100mm for Full HD video. These zoom range/aper-
ture combinations are rare, and expensive even in the
SLR world.
a constant f2.2 throughout the zoom range which is,
in SLR terms, 25/27-69/74mm (16:9/4:3) for stills and
25-100mm for Full HD video. These zoom range/aper-
ture combinations are rare, and expensive even in the
SLR world.
Also as the aperture stays the same throughout the
zoom range in the Lumia 1020, the macro distance of
~15cm also stays the same. With Nokia Lumia 1020
we are actually using the centre part of the lens where
distortions, diffractions and lens shading are smallest,
giving extremely high levels of resolved details and dis-
tortion-free images and videos throughout the zoom
range.
zoom range in the Lumia 1020, the macro distance of
~15cm also stays the same. With Nokia Lumia 1020
we are actually using the centre part of the lens where
distortions, diffractions and lens shading are smallest,
giving extremely high levels of resolved details and dis-
tortion-free images and videos throughout the zoom
range.
5MP
1080p
720p
6
4
2
0
Zoom Quality Comparison
Zoom factor
Traditional 8MP sensor
1:1
Oversampling
Upscaling
Figure 5. Oversampling vs. high resolution zoom in the case of Lumia 1020 (blue) compared with conventional digital zoom
(orange). High oversampling means high image quality.
7