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Filters

It is easy to see that in every professional photo shoot, regardless of locations and types of disputes, participation in the Arsenal of equipment have numerous small accessories. Some of them has the task of creating the right lighting scene or image stabilization (for example, gimbale), problem of other suitable change in light falling on the camera's sensor. It is for this are the filters on lenses – compact, structurally simple, although extremely important optical accessories, which are new to photography, is often overlooked.

Filtration

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How filters work for lenses?

The General principle of operation of most optical filters is extremely simple – each material absorbs light in a certain wavelength range, i.e. a certain color. The rest will be reflected or absorbed through the surface of the material, where optical filters are ultra-thin layer deposited respectively on the glass in a strictly controlled production process. It is this layer determines how the optical range of the spectrum can pass through the filter and to go through the optics of the lens on the camera's sensor or camera, producing an image of high quality. The exception is the polarizing filter, which image are clipped is not certain wavelength, but some light with a particular polarization, that is – simply put – the direction of oscillation of the electromagnetic field vectors. Filters for lenses now available most often in the form of round plates mounted on the outer ring of the lens. But how to choose the right model, with the two seemingly identical filters?

Types of filters

The old days of analogue black and white photography was used, first of all, color filters for lenses, which allow adjustment of contrast depending on the color shooting. The coating had a well-defined color, such as yellow, orange, red, green or blue, and, in addition, differed – except the size (diameter) is also a degree of light transmittance. Today, we are dealing almost exclusively with digital photo color, and the center of gravity has shifted towards improving the quality of the image – the filters seem to be the same, most often, is completely transparent, it is difficult or impossible to distinguish with the naked eye. Currently available filters UV, polarizing, infrared filters and grey (complete and połówkowe). Drones constitute a large group of devices in contemporary photography – often equipped with two types of filters: UV and polarizing, at least – the grey filters.

Filters for lenses photos air

The task of the UV filters is to limit the negative influence of ultraviolet radiation on the image quality, especially during flights in the full sun. Most often, however, UV filters play a protective role in front of the lens. Polarizing filters for lenses reduce light reflection from glass buildings or the surface of the water, which is crucial for the quality of images performed by the drones in position "under the sun". Grey filters allow, and the complex reducing exposure (i.e., exposure frames, for example, when shooting in bright sunlight or in badly-lit events.