When you compare lenses across different sensor sizes, the f-number alone can mislead you, because a smaller sensor needs a wider lens to frame the same shot and that changes the depth of field. This calculator multiplies your aperture by the crop factor to give the full frame equivalent aperture, which is the fair way to compare how blurry a background will be and how much total light the sensor collects. An f/1.8 lens on a Micro Four Thirds body with a 2x factor renders depth of field and gathers total light like an f/3.6 lens on full frame, even though it still exposes at f/1.8. This matters when you shop for fast primes or judge whether a small camera can match a bigger one for portraits. All math runs in your browser and nothing you type leaves your device.
When you compare lenses across different sensor sizes, the f-number alone can mislead you, because a smaller sensor needs a wider lens to frame the same shot and that changes the depth of field. This calculator multiplies your aperture by the crop factor to give the full frame equivalent aperture, which is the fair way to compare how blurry a background will be and how much total light the sensor collects.
Yes. Equivalent Aperture Calculator is completely free, with no sign-up and no usage limits.
Yes. Equivalent Aperture Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Equivalent Aperture Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.