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What is light and how do we use it


posted on 1st of october, 2009

The only real problem in photography be it stock, microstock, art or otherwise, is and always has been light.
Light is the electromagnetic radiation visible to the human eye. In classical physics the wave of electromagnetic radiation has amplitude, which is the brightness of the light, wavelength, which is the color of the light, and an angle at which it is vibrating, called polarization (reflecting windows anyone?). In quantum physics electromagnetic radiation consists of particles called photons, which are packets ("quanta") of energy which move at the speed of light. The brightness of the light is the number of photons, the color of the light is the energy contained in each photon, and four numbers (X, Y, Z and T) are the polarization.
And as weird as it may...

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Comments (35)

Posted by Suebmtl on May 02, 2012
Very useful.Thank you.
Posted by Danienel on December 23, 2009
the f16 rule is helpful when you don't have a lightmeter around as well:

f16 at 1/125sec at 100ISO between 10am and 4pm on a sunny day with the sun should give you an accurate exposure. Add 1 stop for some cloud cover and 2 stops for overcast weather. Each hour before or after 10 or 4 add a stock.

thanx for the lesson - reminds me of Theory of Photography at University and also of high school physics.
Posted by Bepsphoto on October 27, 2009
Thank you!
useful tips.
great!



Comments (35)

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About me

Senior Editor/Admin and Social Media Wizard at Dreamstime. I have enjoyed photography ever since my father first introduced me in the world of arts as a child. Although I have not chosen a career as a photographer I happened to come across a job here, at your favorite microstock site, in 2005. That is when things took a 180 degrees turn and photography took its well deserved place in my life. I have seen hundreds if not thousands of photographers grow and mature into their portfolios and that is an experience I would never trade. I would encourage anyone to follow their hearts and read a l... [Read more]

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