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ND Filters

There is a silver dial on the front left that controls the ND filters with the options of clear, ¼ = 2

stops, 1/16 = 4 stops and 1/64 = 6 stops.

What is a stop using ISO?

Doubling the ISO number gives an increase of 1 stop, while halving gives it a decrease of 1 stop.

What is a stop using aperture?

Because of the way f-numbers are calculated, a stop doesn't relate to a doubling or halving of the

value, but to a multiplying or dividing by 1.41 (the square root of 2). For example, going from f/2.8

to f/4 is a decrease of 1 stop because 4 = 2.8 * 1.41. Changing from f/16 to f/11 is an increase of 1

stop because 11 = 16 / 1.41.

Below shows what everything is doing inside the camera and lens

October 2016 v4