Light is electromagnetic radiation which is visible to the human eye. Electromagnetic radiation is generated by the oscillation or acceleration of electrons or other electrically charged particles. The energy produced by this vibration travels in the form of electromagnetic waves. These waves are characterised by their wavelength (λ) which is the distance between successive peaks and is measured in units of length, and by their intensity, or amplitude, which is the height of each of those peaks.

Visiblelight wavelength

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For studio photography light meters are essential as they guide photographers as to which settings their cameras and studio lights should be at. However many outdoor photographers also use a light meter to gauge fast changing scenes, capture accurate white balance and expose for the highlights. Meters are ideal when using a filter system such as LEE as the bright sky and dark ground can be independently metered, helping to decide on which ND graduated filter which will be required.

According to the wavelengths, the ultraviolet portion of the spectrum is further divided into: UVA (315 – 400 nm), UVB (280 – 315 nm) and UVC (100 – 280 nm). All radiation from the sun with a wavelength below 290 nm, that is most high-energy UV-radiation, is filtered out by the atmosphere before reaching the Earth’s surface. More...

Infrared wavelength

There is a tendency to rely on digital cameras’ built-in meter, and while they are far more accurate than they used to be, many photographers could still benefit from the increased accuracy and reliability of using a dedicated light meter. Sekonik is the de-facto name associated with accurate light metering and we provide a comprehensive range of their products, including grey cards and profile targets. Read the guide to using a light meter on the Exposure Guide website, which will help understand the basics if you are just starting out.

Near-infraredwavelength

To explain how light travels, it is considered a wave. However, light can also be considered particles when describing how it interacts with matter.

Infrared wavelengthrange in nm

A camera light meter provides an exact exposure measurement, informing the photographer of precisely what shutter speed and aperture they should use for any given scene. Employed by studio, portrait, product and fashion photographers, many beginners and enthusiasts are missing out on this essential piece of hand-held equipment. They are crucial for some, yet are often forgotten for others shooting digitally, but can make the difference between a professional looking or average image.

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A light meter offers a reading based on grey point, which is how an internal camera meter also works.It will not only provide the correct exposure, but also save time as photographer will get the exposure correct the first time rather than through trial and error.

Whether checking ambient or flashgun light, inside a studio or outdoors in natural light, whether using incident or reflected metering, there is a wide selection of light meters available at Park Cameras for photographers of any experience level.

Infrared light

The sun emits visible light, but also infra-red (IR) and ultra-violet (UV) radiation.

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The visible part of the electromagnetic spectrum only covers a small range of wavelengths, from 380 nm to 750 nm. In the electromagnetic spectrum, shorter wavelengths (from 10 nm to 380 nm) are ultraviolet (UV) and longer wavelengths (from 750 nm to 1 mm) are infrared (IR) radiation. Ultraviolet radiation carries more energy and infrared radiation less energy than visible light.

Electromagnetic radiation extends from gamma rays (γ) through to long radio waves. This is often referred to as ‘the electromagnetic spectrum’. The energy of a wave depends on its wavelength: the longer the wavelength, the lower the energy. Therefore, in the electromagnetic spectrum, gamma rays have the highest energy, and long radio waves the lowest.

These particles called photons carry each a specific amount of energy. Light intensity increases with the number of photons. For example, intense red light used on a theatre stage and a traffic red light may consist of photons of the same energy but the first one is more intense due to the larger number of photons emitted.