What it frames
The Leica SL3-P with the 7Artisans 9mm f/5.6, over an 8.5 m tree and a 1.75 m person, with hills behind. Everything is drawn to scale: the solid frame is what the camera takes in, the dashed ones are 24, 50 and 135mm on full frame from the same spot.
9mm on the Leica SL3-P frames 80 m × 53.3 m at 20 m: like 9mm on full frame, 127° across.
The numbers
- Frame at 20 m80 m × 53.3 m
- Full-frame equivalent9mm
- Angle of view127° × 106°, 135° diagonal
- Depth of field at f/5.649 cm to infinity (to infinity)
- Depth of field at f/835 cm to infinity (to infinity)
- Hyperfocal at f/5.651 cm
- Hyperfocal at f/836 cm
- Circle of confusion0.029 mm
How it is worked out
The frame at a distance is distance × sensor size ÷ focal length, across and up; the angle of view is 2 × atan(sensor size ÷ (2 × focal length)). Depth of field uses the thin-lens formulas: the hyperfocal distance H = f² ÷ (N × c) + f, the near limit s(H − f) ÷ (H + s − 2f) and the far limit s(H − f) ÷ (H − s), sharp to infinity from H on, with a circle of confusion c of the sensor diagonal ÷ 1500 and, on a zoom whose aperture changes, the maximum aperture taken linearly between its ends. These are for a rectilinear lens; a fisheye takes in more. Ask for this page with Accept: application/json for the numbers alone.