Solutions The ratio of the focal length of a camera lens to the diameter of the aperture being used has 6 entries with similar clues
- piThe ratio between circumference and diameter
- zoomType of camera lens
- radiiIn circle, they are half diameter in length
- reticleNetwork of lines placed at the focal plane of lens for locating and aiming
- reticuleNetwork of lines placed at the focal plane of lens for locating and aiming
- graticuleNetwork of lines placed at the focal plane of lens for locating and aiming