Understand that the aperture stops change by a factor of square root of 2 (1.4) because they indicate the diameter of the lens opening, and increasing the diameter by 1.4 actually doubles the opening area, thus doubling the amount of light that goes in.
Understand that the aperture stops change by a factor of square root of 2 (1.4) because they indicate the diameter of the lens opening, and increasing the diameter by 1.4 actually doubles the opening area, thus doubling the amount of light that goes in.
Photograph a Sunset
Photograph the Eye Close Up
Photograph  Without a Light Meter
Photograph a Jack O' Lantern