Nokia 1020 A00014183 用户手册

moved with very small motors to counteract the unwant-
ed camera movements detected by a gyroscope. 

If you lightly wobble the phone and listen to the camera, 
you can actually hear the module that absorbs the shak-
ing of your hand. Once the camera is activated, give the 
phone the same wobble and the magnets kick in and soak 
up the movements.

The standard factor used for determining good low light 
performance is the amount of visible noise in the im-
age captured. But there is a lot more to it than just the 
amount of noise. 

It is extremely difficult to make a high resolution sensor 
with just a small amount of visible noise because pixels 
must be kept small to keep the sensor size reasonable. 
The smaller pixel size is especially problematic with tra-
ditional front side illuminated (FSI) sensors, because each 
pixel needs many wires to power up the photo diode and 

to transfer the photons out from the pixel. With tradition-
al pixels all these wires are located on top of the pixels and 
light must bypass the wires to reach the photosensitive 
area of the pixel. We used a modern-generation BSI sen-
sor where all these wires are located underneath the pix-
el. With this design a significantly larger amount of light 
can actually reach the photosensitive area of the pixel. 
This again means that we can amplify the signal created 
by  much  lower  levels  of  light,  significantly  reducing  the 
amount of visible noise. 

Another  extremely  important  factor  contributing  to  low 
light performance is the exposure time. A camera can be 
compared to a dam where the shutter plays the role of the 
gate. The longer the gate is open, the more water can flow 
through it. In a camera, the longer the shutter is open the 
more light can be gathered by the sensor.  

However, if the shutter is open too long, the captured im-
age  can  suffer  from  hand-shake,  which  means  reduced 
sharpness.  With its OIS system, the Nokia Lumia 1020 
camera can actually tolerate up to of 3-5 times longer ex-
posure times compared to traditional mobile cameras – a 
significant benefit in low light situations. Using the Lumia 
1020 together with a tripod, users can manually set the 
exposure time up to 4s, which allows you to take amazing 
images in nearly complete darkness.

When discussing low light performance it´s only natural 
to also consider the flash. Even though many prefer the 
natural ambient feeling in images captured without flash, 
even with the very best of cameras we occasionally run 
into situations where the use of flash is mandatory, espe-
cially if the target is moving.  Flash performance is often 
assessed by comparing the light output of different flash-
es, however flash pulse duration is an equally important 
parameter to consider. 

Figure 7. Clever engineering: Ball bearings float the large lens system. Illustration only.