Is neutral mirror and reducing mirror the same thing?

Medium gray mirror and thinning mirror are the same thing.

The reducing mirror is also called medium gray density mirror, neutral grey mirror or grey mirror and nd mirror for short. Its main function is to reduce the amount of light entering the camera. The reducing mirror plays a very important role in a good photo.

The medium gray mirror is a filter added to the camera lens, which can weaken the light entering the lens and reduce the sensitivity. The medium gray mirror has no influence on the color and does not change the light contrast of the subject. The gray filter without any color components has a certain optical density, which can reduce the luminous flux and has no effect on the color, so it is also called neutral gray light barrier (on average, it only weakens the light intensity). It is mainly used to reduce excessive light.

Extended data

Medium gray mirror, also called ND filter, is called ND filter in English.

It is a camera lens with a filter, which can weaken the light entering the lens and reduce the sensitivity. The medium gray mirror has no influence on the color and does not change the light contrast of the subject. For example, if you want to shoot with a large aperture in a very bright place, you can add a medium gray reflector to extend the shooting time, for example, if you want to shoot foggy running water in a very bright place.

Neutral gray-scale mirror, also known as middle gray-scale mirror and ND mirror for short, is a kind of gray pure transparent advanced optical glass. Its function is to reduce exposure by reducing the amount of light passing through the gray lens in the mirror. This filtering function is non-selective, that is to say, the dimming ability of neodymium mirror to light with different wavelengths is equal and uniform, which only plays the role of weakening light and has no effect on the color of the original object. ,

Therefore, the contrast of the scene can be truly reproduced, and color photography and black-and-white photography are equally applicable. According to the ability of "blocking" light, neutral gray-scale mirrors have a variety of densities to choose from, such as ND2, ND4 and ND8 (extending the shutter speed by 1, 2nd and 3rd gears respectively), and can also be used in combination with multiple neutral gray-scale mirrors. It is not difficult to see that the number behind ND represents the light blocking ability of ND mirror.

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