Color filter is also called 'filter'. Optical glass devices that selectively absorb (or pass) light according to different wavebands. The optical filter consists of a lens ring and a filter, and is often installed in front of the camera or camera lens. Color filters for black and white photography are mainly used to correct the color sensitivity of black and white films, adjust contrast, eliminate interference light, etc.; color filters for color photography are mainly used to correct the color temperature of the light source and compensate for colors.

　　Optical color filter, this special optical glass device, is usually made of colored optics or colored chemical film. When using it, install it in front of or behind the lens, and use it to adjust the shadow and contrast of the optical lens, so that the shadow of the scene captured by the lens is similar to that felt by human eyes, and it can also be used through color filters Obtain a specific artistic effect. Color filters are widely used in photography creation, printing plate making, color photography and magnification, and various technical photography.

　　 glass laminated color filter

　　 glass laminated color filter is made of two pieces of colorless glass sandwiched by a layer of colored adhesive film Combined. It has the advantages of high transparency, more grades of pigments made by chemical methods, high absorption and passing capacity of various shades, and easy wiping and storage.

　　 However, the glue film between two pieces of glass, if the optical lens is damp or shocked, will easily cause the lens to open or deteriorate; the thickness of the two pieces of glass will be larger when they are bonded together. If the glass is not polished well, it may also cause the focus of the lens to change and affect the clarity of the image.

　　Weak color filter

　　 Weak color filter can only absorb ultraviolet light and a small amount of blue-violet light, and all other colors can pass through , The absorption power is small, and the pass rate is large. The use of this color filter generally does not affect the exposure, and is mostly used when the illumination is weak or the subject is moving fast.

　　Neutral color filter

　　Neutral color filter can absorb most of the blue-violet light, the absorption power is large, the pass rate is slightly small. Compared with the hue of the photographed scene, the tonal tone of the captured photo focusing lens appears natural and moderate, achieving a more ideal effect. When shooting landscapes, flowers, snow scenes, buildings, outdoor portraits and still life, neutral filters are often indispensable.

　　strong color filter

　　　　strong color filter can absorb all blue-violet light, and can only pass the required part of the color light. The absorption is great, and the pass rate is very small. Compared with the hue of the shot scene, the tones of the photos taken have a strong contrast, and the adjustment of the scene color goes beyond the natural state. Using it to shoot distant scenery can eliminate the haze in the air perspective and make the distant scenery exceptionally clear.

　　The first step aspheric mirror: choose a good material, high density, less dross, and high purity. The transmittance of the white film is required to be 94% from (300-1500nm). The coefficient of expansion is high.

　　 The second step: Choose a good machine for processing, with high precision, high polished surface, and cleanliness of 10/5.

　　 The third step: Inspection requires imported equipment, radius of curvature, and overall surface shape.

　　 The fourth step: piping, shipping. The cold working is completed.

　　 The fifth step: coating is also a more critical step.

　　 The sixth step: Plating a high transmittance coating.

Step 7: Measure the transmittance.

　　 Step 8: Shipment.