Optical filter is the kind of optical instrument which is used to choose the necessary radiation wave band.

The classifications of optical filter are as follows:
1. Colorful optical filter. There are various kinds of colors for flat glass or bright film. The largest scale of radiation can be over 100 kilometers. It is widely used in the broad-band photometry instruments and phototropic visions. The advantage of this kind of colorful optical filter is the largest size. It can be made to any large size upon your request!
2. Film optical filter. It can be divided into film absorbing optical filter and film interfering optical filter.

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