A variable neutral density ND lens filter reduces the amount of light that enters a camera. A variable ND lens filter is very flexible as it lets you alter light exposure between around 1 f-stop ND2 and 10 f-stops ND simply by rotating the outer element of the filter. And it does this without affecting the colour or quality of your images. In particular, photographers who deal with changing light conditions, like in landscape or nature photography, find this filter a godsend.
Variable ND filters consist of two circular, polarizing layers of glass that are placed in opposition to each other.
They are easily screwed onto a camera lens with the inner layer staying fixed as it is screwed onto the lens while the outer layer is attached to a ring at the front of the filter frame and can be rotated.
The inner polarizer cuts out light in a single plane. As the outer polarizer on the front element is rotated, it reduces an increasing amount of the available light, the nearer the front layer comes to being perpendicular to the inner layer. Essentially by rotating the filter the two polarizing layers block out increasing amounts of light as they come into alignment. You simply twist the outer layer to increase or decrease the light exposure, until you achieve the desired effect.
A single fixed ND filter reduces light by a set stop. But with a variable ND filter, you can adjust the range of light exposure from 1 f-stop of light with an ND2 to 10 f-stops of light with an ND depending on which design and brand of filter you choose. The filter shows the minimum and maximum markings on its frame which give a guideline to the individual density ranges.
Since you can select what range of light you want to allow to reach your camera lens, the variable ND lens filter offers great flexibility and convenience and is also easy to use. It saves you having to carry around separate filters for different light conditions. Everyone knows that empty space in your kit bag is worth its weight in gold, so these easy to use and multifunctional filters are definitely something worth considering.
The handheld weight of your kit can really make the difference between a fun day out shooting and a gruelling time out with a sweaty back and aching shoulders.
By simply rotating the filter, you can slow down shutter speeds to create beautiful effects such as motion blur. Words and Photography by Urth HQ. Fixed ND filter. Variable ND filter. How do neutral density ND filters work? Shot with an Urth Variable ND Variable ND filter vs fixed Variable NDs offer great convenience for photographers who work with changing light conditions, like in outdoor or travel photography.
Which ND filter is best for you? Recommended Reading. Most read. Load more. See our new carry range Backpacks, camera inserts, laptop sleeves and tech organisers. It is up to the photographer to select the right shutter speed and corresponding filter to make an otherwise ordinary shot something more powerful.
Variable ND filters are essentially two polarizers placed together with one plane preventing a fixed amount of light and the other rotating to prevent incremental amounts of light from entering the camera. Variable ND filters can be advantageous to the photographer on the go. Carrying a set of fixed ND filters and constantly changing fixed filters can be cumbersome and time-consuming.
With a variable ND, the photographer can just rotate the filter like a polarizer to get the desired effect. Almost all ND filters have some sort of color shift. When an image is produced that has a green color cast, it is often the result of a poorly designed filter. On the other hand, when infrared IR light penetrates the camera sensor, the resulting image can have a magenta cast. Color shift is amplified by low-quality materials, poor manufacturing, and ignoring the infrared band of the light spectrum.
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