F-stop is a consistent way to measure lens aperture, and helps photographers control exposure and depth of field. It is noted ...

A smaller F stop number will signify a wider aperture, which in turn results in a narrower depth of field or more blur. For example, an F/1.8 aperture will blur the background more than an F/3.5 ...

The f-stop number actually refers to the size of the aperture opening, calculated by dividing the lens's focal length by the f-number. For example, with a 200mm lens, an f/4 aperture would have a ...