IR Filter and Infrared Photography

An infrared filter is a filter to remove visible light and only pass infrared light in different wavelengths. Here are some types of IR filter to choose from: • The Kodak Wratten 87, 87A, 87B, 87C (87 starting at 750nm, 87C at 800nm, 87B at 850nm, 87A at 950nm) • The Hoya R72 (High quality filter starting at 720nm, which includes some visible light) • The Hoya RM90 (High quality filter starting at 900nm) • The Hoya RM100 (High quality filter starting at 1000nm) • The M&K 1000 (High quality filter starting at 1000nm) • The M&K 093 and 095 (starting at 830nm) When these filters are used together with infrared-sensitive film or sensors, very interesting “in-camera effects” can be obtained; false-color or black-and-white images with a sometimes lurid appearance known as the “Wood Effect“. There is no doubt that infrared B&W photos have some dreamlike magic as these photos … Read more

UV (Multi-Coated) filter

UV radiation is invisible to human sight, but in photography it turns out to be disturbing for the image quality. An UV filter is transparen’t to visible light, and so can be left on the lens for nearly all shots. The UV filter absorbs ultraviolet rays without changing the exposure. With most images, most people will not see a difference when a UV filter is used. UV sensitivity seems to vary from one digital camera to the next, but most digital cameras seem to be substantially less UV-sensitive than film. In fact, few digital cameras are UV-sensitive enough to reap a noticeable optical benefit from UV filtration, even in the most extreme UV conditions-at very high altitude (well over 10,000 feet) or in very long shots over water. UV Filter reduces unwanted ultra-violet light and haze. Due to its multi-coated feature, it allows nearly full light transmitting into the lens … Read more

Photography Basics: Polarization Filters

The use: A polarising filter (or polarization filter) is used to remove reflections from a shiny surface and make blue skies darker. Types: Linear and circular polarizer. Circular is recommended. Manufacturers: Hoya, B&W and Cokin, using different depths of filter mount. Recommendations: not to use with wide-angle lenses and UV Filters. A polarization filter only allows light to enter the lens in a specific direction whilst absorbing other light. If used for its traditional role of removing reflections, by polarising the light reflected from the surface it permits the actual subject to be viewed without reflections. When removing reflections the optimum polarisation effect will be achieved with the camera at a 30o ~40o angle to the subject. By rotating the polarising filter different parts of the subject can often be polarised changing the overall effect. The part of the world you are photographing will also make a big difference to the … Read more

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