Asus Zenfone 4 Review

February 9, 2018 | Mark Goldstein |
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Image Quality

All of the sample images in this review were taken using the 12 megapixel JPEG setting, which gives an average image size of around 4Mb.

Noise

The Asus Zenfone 4 has 8 manually-selectable ISO sensitivity settings available at full resolution, ranging between ISO 25 and ISO 3200.

JPEG RAW

ISO 25 (100% Crop)

ISO 25 (100% Crop)

iso25.jpg iso25raw.jpg
   

ISO 50 (100% Crop)

ISO 50 (100% Crop)

iso50.jpg iso50raw.jpg
   

ISO 100 (100% Crop)

ISO 100 (100% Crop)

iso100.jpg iso100raw.jpg
   

ISO 200 (100% Crop)

ISO 200 (100% Crop)

iso200.jpg iso200raw.jpg
   

ISO 400 (100% Crop)

ISO 400 (100% Crop)

iso400.jpg iso400raw.jpg
   

ISO 800 (100% Crop)

ISO 800 (100% Crop)

iso800.jpg iso800raw.jpg
   

ISO 1600 (100% Crop)

ISO 1600 (100% Crop)

iso1600.jpg iso1600raw.jpg
   

ISO 3200 (100% Crop)

ISO 3200 (100% Crop)

iso3200.jpg iso3200raw.jpg

Focal Range

The Asus Zenfone 4's main fixed focal length lens is equivalent to 25mm in 35mm camera terms. It also has a second 8 megapixel rear camera with a lens that is equivalent to a super-wide focal length of 12mm in 35mm camera terms.

25mm

focal_range1.jpg
 

12mm

focal_range2.jpg

Super Resolution

The Super Resolution mode captures a 48 megapixel image, 4x larger than the native resolution of the main camera, but the resulting image suffers from a distinct lack of fine detail, so much so that we wouldn't recommend using it.

Off

On

super_res_off.jpg super_res_on.jpg

Macro

The Asus Zenfone 4 is able to focus as close as about 5cm from a subject. We found this claim to be accurate, though autofocusing does occasionally struggle to lock on at this kind of range.

Macro

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Flash

The Asus Zenfone 4 uses a LED flash, and as usual for this technology, it gives a weaker flash burst than a standard xenon camera flash.

Flash Off

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Flash On

flash_on.jpg
 
Selfie Mode
flash_selfie.jpg

Night

Thanks to the 4-axis optical image stabilisation system, wide f/1.8 maximum aperture and maximum shutter speed of 32 seconds, the Asus Zenfone 4 performs well at night. This image was taken at the camera's ISO 25 sensitivity at a shutter speed of 32 seconds, and though there's some noise and detail smoothing, the result is still comparable to what a typical compact camera would produce.

Night

night.jpg

Panorama

The Asus Zenfone 4's automatic sweep panorama mode works well and lets you stop panning at will. The results aren't always perfect, but ghosting is rare. The Asus Zenfone 4 has enough processing power to capture panoramas at fairly high resolutions - they are usually around 992 vertical pixels, with a maximum width of 9600 pixels.

panorama.jpg