Frequently Asked Questions (FAQ)

• What is the aperture area?

• An aperture area is the total area of a hole or an opening through which light enters.

• How do you find the focal length of an f-number?

• To calculate the focal length, use the formula: F = N×D. where N is the f-number and D is the aperture diameter.

• Is focal length and f-number same?

• The focal length is the distance between the center of the aperture and the point in space where distant light rays come to a focus. The f-number is the focal length divided by the aperture diameter of the lens.

• How do you calculate the f-number of a lens?

• To calculate the f-number of a lens, use the formula: N = F/D. where F is the focal length, and D is the aperture diameter.

Related Calculators