Ask for advice on photographic calculation problems ~

The specifications of the aperture are as follows

f 1.4 F2 f 2.8 F4 f 5.6 F8 f 1 f 16 f22 f32

The exposure of each level is half that of the previous level.

For example, f 1.4 is twice that of f2.

Therefore, under certain ISO conditions, all reciprocity can be calculated by comparing with time.

ISO exposure is half of 200 according to the number 100.

Next time, you can do whatever you want.