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You are here: Home » External Light Meter in Digital Photography

By Abhishek Ghosh March 11, 2013 5:16 am Updated on March 11, 2013

External Light Meter in Digital Photography

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External Light Meter is a standalone device for measurement of brightness on the subject which is measured in SI unit of illuminance lux (lx) for the exposure. Many thinks that an external light meter is not needed in Digital Photography. It is actually a wrong concept. Right quoting from one experienced and aged photographer’s comment from a forum – “It’s pretty much required for serious studio work and pretty much not necessary for landscape work.” We wrote about Studio Setup before. Now it is required to combine the old read (if already read) knowledge with this article’s knowledge.

 

Basics of an External Light Meter

 

First method to determine the proper exposure of the photographic material was thought since 19th Century and photochemical processes were used, in which the blackening of a treated with a photosensitive material was observed with the eye and was compared with a comparison example scale.Now, typically an external light meter allows the photographer to determine which shutter speed and f-number  for an optimum exposure, in a certain given lighting situation and film speed.

Modern external light meter for measuring light uses one light sensor. There are of photoresistors and photodiodes varient. The light sensor must have a spectral sensitivity of the luminosity curve of the eye and needs to be adjusted.

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Newer equipments and external light meters often work with a cadmium sulfide (CdS) photoresistor. The resistance profile of photoresistors is strongly nonlinear, so often no range switching is necessary.

 

More on External Light Meter

 

External-Light-Meter

 

Now, some readers will rightly ask at this point the question, that why we (still) requires an external light meter ? Well, it can not be dismissed out of the hand, that the importance of an external exposure meter has decreased significantly by digital photography, because modern cameras have built with an internal light meter.

Nevertheless, the external light meter has retained its place in some areas. Especially in the area of studio photography – it makes the external light meter useful. Also in the photograph of the exposure of buildings is usually more accurate than the measurement than that of the internal light meter of the camera works better. Shooting at night, this external light meter allows the to measure the exposure time correctly. The only drawback is the cost of the acquisition and the extra weight in your bag, but that is negligible. Exposure meters can measure all types of lighting (daylight and flash) and are priced accordingly.

 

Abhishek-Ghosh Tagged With photography external exposure meter

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "External Light Meter in Digital Photography," in The Customize Windows, March 11, 2013, February 4, 2023, https://thecustomizewindows.com/2013/03/external-light-meter-in-digital-photography/.

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