What is the mismatch problem between box cameras and lens?

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Shortage of resolution often occurs on a combination of box camera and lens, usually two causes lead to this problem (as shown below), and the problem makes the picture appear blurry (more specifically speaking hazy):

1) A SD lens is used on a HD IPC.

2) A larger image format lens is used with a camera of smaller image format.

The mismatch between lens and camera leads to this phenomenon. When applying a HD IPC, you’d better choose a HD lens with similar image format size and make sure that the image format size of lens is no less than the size of IPC. Only when the listed two conditions are satisfied, we can solve the problem.