How hard is the lens of the mobile phone camera, and is it easy to scratch?

Generally, the lens of mobile phone camera has a coating AF on the glass surface. The surface hardness of ordinary AF is 7H, which is equivalent to Mohs hardness of 2. At present, some models of high-end mobile phone camera lenses will be coated with an ultra-hard AR+AF coating with a Mohs hardness of 5, which is not easy to scratch.

According to Mohs hardness, the hardness of iron is 4-5, and that of glass and stainless steel is 5.5.

camera lens

Generally speaking, you have to grind off this coating on the surface of the camera lens to make it directly grind off the glass. This coating is mainly antifouling and its thickness is nanometer. Without wear, the hand will be slippery, and there will be no fingerprints left on it, which will be worn off. If you press it by hand, it is a dirty piece.

If it is an ordinary AF coating, it is still easy to scratch (the hardness is equivalent to your nails, and the Mohs hardness of nails is 2). But this coating is too thin to be seen even if it is worn. You can only judge whether it has anti-fouling function (press it with your hand to see if there is any fingerprint residue), or drop a drop of water on the surface to see if it is lying or standing (drop angle test).

If it has been worn off, congratulations. Unless your mobile phone often touches stainless steel, it will not scratch, because the Mohs hardness of glass and stainless steel is 5.5, but without this coating, the lens is particularly easy to get dirty.