Understanding: EQUIVALENT EXPOSURE
Understanding Equivalent Exposure Maintaining exposure value while using different settings. Shutter Speed x f-stop = Exposure Value EQUIVALENT EXPOSURE If we have a normal light meter setting of 500 at f11 for a subject and we want to open the shutter up for a LONGER time to allow for blur and thus we set the shutter to 250 we now must adjust the aperture to KEEP THE LIGHT THE SAME as it falls on the film. The shutter was set to let in MORE light so the aperture must be set to let in LESS light to keep the amount equal. So, we move the aperture to f16 and now we have an EQUIVALENT exposure. If we move the shutter to 125 the aperture would move to f22 which is about as small as most cameras will go. All of this works because each setting of the aperture AND the shutter are each half or double the one next to it. If you’re changing from 1/125 to 1/60 that means the shutter speed was doubled. Allowing more light to enter the lens, m...

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