Ok im also confuse wid aperture
Is English your first language?
The number associated with aperture is usually written "f/2.2" and called your f-stop. This corresponds to a mathematical ratio, such as written
1/2.2 or
1:2.2. The "1" part is discarded and "f" written instead. So what is the ratio measuring?
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.
This means that if the aperture diameter itself grows, the f/number seems smaller*. Many people come to understand this. However,
if the sensor is closer to the pupil, the f/ numbers ALSO seem smaller. You can't just assume the number indicates a large or small aperture... you also have to know the construction of the image focal area in the camera. So you can't compare iPhone to Mavic to DSLR aperture easily.
* f/2.2 may seem smaller than f/22 but it's actually a lot larger; remember this is the divisor so 1/2.2 is much bigger than 1/22 numerically and physically.
Now, if you compare apples to apples (not necessarily Apples), then you can recognize the effects of changing your f-stop. The smaller the divisor in the ratio, the bigger the aperture, and the shallower the focus range is, and the more "bokeh" (ぼけ) blurry background you get. The smaller the aperture, the bigger the divisor in the ratio, and the deeper the focus range is, and the less you get anything out of focus. However, the amount of blur or focus is going to be relative to other parts of the camera construction, so you still can't compare iPhone to Mavic to DSLR aperture easily.
