Last edited by Mandy_ASUS on 2015/6/19 14:23
This article is quoted from ZenTalk TW, and the author is 沙沙比.
Source link: http://www.asus.com/zentalk/tw/forum.php?mod=viewthread&tid=60655
Although the camera of mobile phones are limited to the size of the photosensitive components and the number of lens, and therefore its night shooting quality cannot compare to DSLR-like cameras.
In this article, we tried to exert the limit of the Zenfone camera to see if it can take photos with qualities good enough to share on Facebook.
Firmware version: 2.20.40.9_20141021
Camera APP version: 1.1.0.141112_2
The secret to successful night shooting is to accurately control the exposure. In this photoshoot, we used the “Touch auto exposure” mode in response to the metering problem due to the light contrast of night views are too great.
※ In order to compare the differences between different exposure and color temperature settings, except for the photos that are especially noted, all other photos are reduced to 1600*1200 and sharpened by 10% with no contrast enhancing or noise erasing.
※ EXIF info is provided with the photos for reference, and Unknown is used for the light source to represent automatic white-balance mode.
※ Since the night-shooting mode will reduce the shutter to 1/4, the camera shakes easily without the help of a tripod, and the white-balanced cannot be customized; therefore, night-shooting mode is not turned on for this testing.
1. War between shutter speed and photo quality - ISO
When the touch auto exposure mode is selected, pressing on the screen allows you to change the sampling position for camera metering, causing different exposure parameters.
#1 When metered towards the edge of the building, ISO increased to 1450, which is close to the maximum 1600. At this time, the red and blue noises in the sky clearly increased and the contrast between the light and the sky is not that strong.
#2 When metered towards the light of the building, ISO was 830, which is good enough to upload and share on Facebook.
#3 The photo was prettier and the sky was clearer when curves and sharpness adjustment were used; also comparable with consumer digital cameras.
The 1/12 second shutter is the limit of general mode, and when the aperture is fixed at f2.0, the higher the ISO, the brighter the photo; but at the same time, the poorer the photo quality.
When there is insufficient light, Zenfone will first reduce the shutter to the limit and then increase the ISO. Therefore it is important to keep your hands steady during night shooting. In order to prevent the photo from being blurry, the more stable your hands are the instant the shutter is pressed, the better it is.
Sometimes in order to get better photo quality, we can set the ISO to the highest value, for example 800 or even 400; but because the shutter has its limits, there will be underexposure if the light is too dark.
2. Beautiful mistake – Manual white-balance
Automatic white-balance mode was used for the two previous photos, but after all the automatic mode of the camera is achieved through an algorithm, and therefore it cannot determine what “beautiful light” is.
Sometimes selecting the wrong white-balance mode on purpose allows you to get better photos. 
#4 The color of fluorescent light mode is slightly yellower than automatic mode so that the colors won’t look so cold; ISO is also decreased to 640 to slightly increase the photo quality.
#5 Sunny day mode; the yellow lights on the building walls look stronger, displaying a magnificent effect.
#6 / #7 LED is colder under fluorescent light mode.
#8 / #9 The overall photo looks warmer under automatic mode or sunny day mode.
3. EV
Adjusting EV (exposure compensation) means changing the shutter and ISO combination. When EV=0, the camera will calculate the “Normal” exposure combination (shutter speed and ISO) according to its algorithm.
If EV is a negative value, the shutter speed will increase or the ISO will decrease, and the photos taken will look darker.
If EV is a positive value, the shutter speed will decrease or the ISO will increase in order to sense more light.
#10 / #11 / #12 During night-shooting, the author’s habit is to decrease EV to -1/3 or even -2/3 so that the overall photo will look darker in order to highlight the brightness of the light.
#13 / # 14 Changing the metering point allows you to get different exposure effects.
#15 Turning on HDR accommodates a greater contrast of light.
Hope everybody is happy. ^^
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ZenTalk_FAQ
Ng Kok Yu
