The more light through the lens, reflector is weaker. Uncoated lens has relatively low transmittance, the lens surface of the more serious reflection on the spectrum have a strong reflection of light, so the overall color is white reflective; SC single-layer coating lens, the lens of the reflective surface is weak, greatly increasing the spectral transmittance of the central yellow green, only red and blue ends of the spectrum was only reflection, so general was light blue reflective purple; SMC multi-coated lens, The high transmittance of the lens, the lens surface of the direct reflection is very weak, need to cover the end of the lens cover, backlit glass lens opposite view, observed from the side of the lens can see the color of the reflective, this reflection by the different factory coating characteristics can be divided into dark red (AR Blu-ray), blue (AR red), dark yellow (by transparent blue-green) and dark green and so on.
Dark green coating which can increase the spectrum of blue and red ends of the transmission, only the central part of the spectrum was only yellow-green light reflected back, so the antireflective film of the transmittance curve of a red and blue an increase in the peak and effective along the wide color gamut. Consider that if all the lenses are antireflection coated with the same membrane, bound to occur if the lens color cast. Therefore, each different camera lenses, the lens must be based on the materials used and the extent of absorption of different shade, were coated with antireflection coatings with different characteristics, each with up to make the lens to increase the total light transmittance, and The transmittance of the lens shade can reach equilibrium. In general, the outermost layer of the coated lens is usually the dura mater, it will not do harm to lens when general's hand touch or cleaning happens. This point, whether it is a traditional SLR camera or digital camera lens consumer alike.
Although, this layer of film has a protective effect, but in fact its thickness may be IP67 Waterproof Outdoor Module Led Flood Light only 0.1 nm, the friction is too strong, or will damage this layer of film formation, thereby affecting the shooting. Therefore, multilayer lens cleaning method, there are several points to note: Cleaning fluid selection: general use of anhydrous alcohol or ether (or a mixture of both) - (Note: ether as toxic chemicals). If you must clean up with water, you need to find ionized water or water, or leave the water classes. Choices for clean cloth: You can use cotton, the most simple and cheapest one. If the fiber left off, with the balloon can be blown off. Generally have a special camera lens shop selling paper, the deerskin, non-woven like cleaning supplies. Leather or cloth products should be used as frequently as possible. Because these reusable things will scratch the coatings when there is very small or hard sand deposition on it.
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