On 6/14/2018 at 9:27 AM, 0&1 said:
Cool, could you plz show this in an image or drawing?
- With a larger aperture you basically have a bigger lens collecting the light rays. This means that outside (closer or further away) of the focal point where the light rays cross, they diverge more quickly because of the larger angle difference between them, meaning more blur. A pinhole camera would be an example of a camera with very small aperture, where light rays enter parallel to each other through the pinhole and everything is sort of in focus.
- The "physical" size of the blur relative to the objects you are taking picture of stays the same regardless of the focal length and only depends on the aperture. However, with wide-angle lens faraway objects appear very small in the picture, but so does the blur, so it looks like everything is in focus.