This method starts in manual mode and stays in manual mode and is used for Group 3 cameras with a mode dial (such as the Canon 5D Mk III). Use this method for long term photography when you need good exposures in daylight and darkness. Because of Tv and Av stepping, you will need to use GBDeflicker to remove any traces of flicker.
This method is similar to the camera’s Program mode, but much better because the AutoRamp algorithm gradually changes the exposure based on the history of previous exposures and the speed at which the sun is setting. Whenever the bulb time exceeds the Av shift time, the Av f-number is decreased in 1/3 stop steps up to its maximum value. After the Av reaches it minimum f-number, the ISO is increased in steps to 3200.
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