 |
| |||
| f-number; stop number (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens); aperture size; pinhole size | |||
|
| |||
| f-number; stop number (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens); aperture size; pinhole size | |||