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Digital camera lens coating effect and influence by BatteryCharger03
Why need coating lens?
Why lens and lens to coating? This is because any object to light have reflection action, even the colorless transparent glass is not exceptional also, differences in the Angle of the light would form reflex effect. For an ideal lens is concerned, the light can completely through the lens, and the correct in film or CCD completely on focus. However, in fact is, every kind of lens is their own physical factors, like the poor to limit produce (see a speak), so, by many have “problems” lenses have combined with a lens is not possible in theory of all angles to all the light complete through. With lanthanide oxide optical glass for example, the light transmittance can achieve 90% above, and the remaining 10% will reflect out, form dazzle light. In order to make up for the loss of the lens, then researchers have developed in the lens is coated with film to increase pervious to light effect.
Lens coating technology
Although in the 50 s, designers will know that coating can reduce the occurrence of dazzle light, also can enhance the image contrast and reduce the pictures of the halo phenomenon. But due to the without the proper processing technology. So, in optical lens coating has been only is the highest level of camera lens to just enjoy the privilege. Until 1968 a new generation of coating technology being developed, let coating process and the execution of the standard can be cheap, to have the increasingly popular lens coating. In 1970, as a coating technology development, we can understand the watershed of the before and after technical differences:
Chemical coating method: before the 70 s, coating methods mostly with chemical reaction to give priority to. This method must be strict control of chemical solution, the concentration of the bridge, the combination of agent of reaction time and conditions, etc. Because, can only batch production, obtained by the quality and yield, and defects not neat. More commonly used processing method: one for hot-dip method, the other story for spray plating method. Hot-dip method is based on the nature of the membrane to configuration are prepared, and the composition of the solution will be glass heated to a definite temperature in configuration, good chemical solution, take out, drying, hot-dip method is the only can also produce double mask method. But some of the lens, then design requirements, do not need to double mask. Therefore, must will wash the other side, increased costs and environmental burden. Another kind of spray plating method, the film is configured with the airbrush in solution, spray in glass surface, drying, finalize the design. Glass carrier can move or rotation is to increase the uniformity of the film. Can double or single plating. In this way the extension and a rejection of glue. The solution to the lens center, using drip lens high speed rotating centrifugal force, will even “” throw solution” on the surface. Now point of view, the benefits of chemical coating, its equipment of low investment, so it is still a kind of organic film plating commonly used and low cost method.
Physical coating method: chemical preparation with low price, easy operation, but also the relative advantages of the pollution large, cannot plating multilayer faults. A new generation of coating technology in physics to way to vacuum plating, steam ion plating, etc DuoZhong different forms. The way of physical strength and uniformity of coating chemical coating, and general prep above chemical method coating layer than physical method (because of plating multilayer, temperature and chemical effects of physical property of the upper film).
The kinds of coating
In order to meet the requirements of all kinds of photography, the modern lens must often covered in multilayer films. The function of these films are different, can be divided into seven categories: increase through film, reflective film, filter, polarization film, protective film and low-temperature. And the modern multilayer technology can be traced back to 1971 roughly by Asahi (PENTAX) optical company of development the SMC (super multilayer) technology, in 1971, application of the technology Takumar lens in many exhibitions cut a dash on. The Nikon has 3 at layer coating technology, more than five layers of coating technology in theory has been feasible. Japan’s Canon and German Leitz (called) also company Leica positive development similar coating technology, but limit 7 layer coating is still difficult to break through the bottleneck!!!!! On the other hand, claim to the development of their FujiFilm electron beam coating EBC coating electron beam () claims of 11 layer can be!!!!! Until the Asahi (PENTAX) released shortly after the SMC technology, FujiFILM also soon EBC coating technology import cameras manufacturing.
Asahi main sources of technology OCLI (Optical Coatings bought from Laboratories Inc.), and the subsequent to the multilayer their coating technology, which improvement and development for his own technology and the cost control within acceptable limits. SMC for photography of optical a turning point, it makes the development of modern super wide Angle lens and long zoom lens possible. Asahi technical breakthroughs, let many main camera manufacturers, including Canon, Nikon and Zeiss licensing fees are paid to the Asahi use some or all of the technology. The success of the Asahi, let the multilayer the naming of a new lens change: in the past, the SC said, TLC for double layer coating, SMC for PENTAX technology of multilayer, and the subsequent and MC multilayer film and the development of the SSC pervious to light. Fuji, have been used as a trademark. The EBC
From the history, although SMC coating to see the technology is very attractive, but consider the maturity is insufficient, Leica has not cut investment. In fact, according to the writing of Micci Maurizio in 1974 Fotografare magazine-lens of glare test is to be found in Super-Takumar > > EBC Fujinon Takumar MC of dazzle light, in fact Takumars SMC evaluation score than Super high Takumars-only a little bit. So can understand the LEICA consideration is not makes no sense. Since 1972, LEICA has been committed to reduce optical lenses and other fields to curb the dazzle light until 1978, was suddenly changed their position began to use multilayer film coating technology. By 1981 as the development and Fuji a new generation of electron beam coating technology, or called hard coating. Fuji in Japan (EBC reflection of not beautiful, also in 1981 the Super EBC launch the improved technology, continue to use up to now).
Coating color
In general lens coating layer of surface itself is colorless transparent. Only through the lens of the light will not reflected back, form the human eye visible reflect light. Through the lens of the more light, reflective is weaker. Not the lens, the lens coating of low light transmittance, lens of reflective surface is more serious, the various light spectrum to have the strong reflex, so the comprehensive color for white light glance; SC, its the lens of the single plated film lens of reflective surface is weak, greatly increases the spectrum of the green light yellow central through rate, only on both ends of the spectrum of red and blue light is reflected, so the Light Blue purple, reflective general SMC multilayer coating lens, the lens of light transmittance, lens surface extremely high directly reflective is very weak, the need to cover the camera the end cap, opposite the lens of glass, from the lens watch backlight side observation to see color, this reflective glance in accordance with different manufacturer coating properties can be divided into the dark blue), (through deep blue (red), through the dark yellow (increase through blue green light) and dark green. One dark green coating can also increase on both ends of the spectrum of blue and red light through rate, only the central yellowish light spectrum to be reflected back, so the increase of membrane through through rate curve has red, blue two increase peak, effective along the wide gamut. Consider if all the lenses are on the same kind of increase plating, the lens through film will surely happen partial color. Therefore, each lens, must according to different lenses used to the material and its lens different colored light absorption degree respectively, covered in different characteristics of the film, mutual collocation add it up, can make the sum of the lens, and can increase light transmittance lens on color shade through rate balance.
The maintenance of the coating
Generally speaking, the outer lens plating is usually hard film, for the protection of the general’s hand to touch or clean lens harm others will not. This, whether the traditional SLR lens or camera is all but consumer digital. Although, this layer membrane has protective effect, but in fact its thickness may only 0.1 nm, too strong, or will destroy this friction membrane, which affects the level of take the result. So, to multilayer lens clean method, have what time is the need to pay attention to:
Cleansing liquid choice: general use no water alcohol or ethyl ether (or both)-the mixture (note: ether for toxic chemicals). If must clean water, need to find pure water, or it will be experienced or leave water class.
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