Kalkulator ng F-Number
f-number N = focal length ÷ diameter ng aperture.
Relative exposure lang.
Paano gamitin
Paano gamitin
- f-number N = focal length ÷ diameter ng aperture.
- Choose one unknown and enter the other two positive values.
- Review f-number and relative exposure ratio.
Formula
N = f / D; doubling the f-number reduces geometric aperture area by four, before transmission losses.
Valid domain
Focal length, aperture diameter, and f-number must be finite and greater than 0. Ipinapalagay ng relative exposure na pareho ang transmission at shutter/ISO; hindi ito exposure meter.
Mga madalas itanong
Maaari mo ring alamin
Does this measure exposure?
Ipinapalagay ng relative exposure na pareho ang transmission at shutter/ISO; hindi ito exposure meter.
What is f/2?
An f-number of 2 means the aperture diameter is half the focal length.