5) All About the EV Scale

The EV scale is centered at zero and extends 2 or 3 stops in both + and – directions, graduated in 1/3rd of a stop intervals.

If you go up on the + side, you are letting more light in, so increasing the exposure. If you go up on the 1 side, you are giving the picture a shorter exposure, which lets less light in.

The EV scale uses the same principles as f-numbers and shutter speeds.

Each full stop in the “+” direction will double the amount of light allowed to fall on the sensor, so making the picture lighter. Every full stop in the “-“ direction will half the amount of light allowed to fall on the sensor, so making the picture darker.

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Ed Mercer

I am the other half of our husband and wife Photography studio with my wife of 41 years Sue. We opened our studio in Danvers, Ma in February of 1979. As members of Professional Photographers of Mass, New England and America, our goal in life is simple – Capture the beauty in every subject and create timeless joy to share. We are still at it after all these years and love what we do as much as when we started. Together we are also teaching and coaching photography, image editing, and the business of photography.

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