I was actually reading some threads for newbies on how to calculate stops.
Below example from
7. How do we calculate stops?
Assuming the light entering the camera remains constant, we can play around with the value of the ISO, shutter speed and aperture value while maintaining the same exposure.
Ex 1: Assuming ISO 100 is constant. f/8 at 1/250s is equivalent to f/11 at 1/125s. Why? When we set the aperture from f/8 to f/11, we are reducing the light by 1 stop (half the amount of light now enters the camera). So to maintain the same exposure, we need to increase 1 stop from the shutter speed, hence 1/250 to 1/125 (time now is double, so we have double the light).
The question for me is how to determine the initial ISO, Aperture or shutter speed?
Better said, to take picture in a restaurant with warm light, what should be the initial shutter speed or aperture or ISO ?
or how do I get the correct exposure.