Q: the rear-view type dash cam is convenient to be installed.

A: the disadvantage is that the shaking and dark mirror will affect to observe the rear condition.

In addition, confirm whether an-glare is also affected, whether it is used in safety glass. Also, consider adjusting the different angle if drove by different people.

Q: the edge is distorted

A: the wider range of the image taken is convenient to obtain evidence. The dash cam with wide angle must have a deformation edge. If cut down the distorted edge, the effective information will lose.

Is the larger wide angle is better?

A: although the large wide angle has a wider range. Of course, it also has a noise. It is noticed that some businessmen promoted the dash cam with 140 degrees, although only 100 degrees. So as far as possible choose a brand product with the good reputation.

Q: which one has a good clarity?

A: Clarity is a comprehensive embodiment of product performance, mainly related to image processing chips, image sensors, and lenses, not just to see what chips, parameters labeled pixel values. Some bad manufacturers are tampering with the lens, which is no different from the image sensor, but in fact, the lens has a big impact on clarity and night vision.

In order to improve the wide angle and the image quality, the dash cam generally used multi-glass, at the same time, it also reduces 30% to 40% light. For improving the transmittance, some high-end dash cam also uses multi-layer antireflection film of the advanced optical lens. Jerry grained lenses ( only coated with a single layer of film) are usually found to be blue-purple or red under light, while those coated with a multi-layer antireflection film are green or dark purple.

Q: which one has a good night vision?

A: it is simple to test the night vision effect, you can compare several the night vision effect! However, it is not good. With the support of the lamp, there is no difference between the nighttime and daytime. If you consider the parking monitoring, at least the moon should be shot clear.

7, SLR night vision

A: the reason why the SLR has a good night vision is that the pixel is big. The sensor of the dash cam is about 1/3 inch, the bigger total pixel, the single pixel is smaller. Aptina0330 and 0331 is 2.2m, OV4689 is 2.0m, IMX122, and IMX322(better ) is 2.8

Of course, it must be matched with multi-layers coating lens, the night vision dash cam can be fully demonstrated. 

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