What it frames
The Fujifilm X-T30 III with the Fujifilm XF 150-600mm f/5.6-8 R LM OIS WR, over a 30 cm bird on a 1 m fence post. 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. Its APS-C sensor (23.5 x 15.6 mm) has a crop factor of 1.5, so the dashed frames are marked with the focal length that gives the same view on it.
150mm on the Fujifilm X-T30 III frames 2.35 m × 1.56 m at 15 m: like 225mm on full frame, 9.0° across.
The numbers
- Frame at 15 m2.35 m × 1.56 m
- Full-frame equivalent225mm
- Angle of view9.0° × 6.0°, 11° diagonal
- Depth of field at f/5.614 m to 16.1 m (2.1 m)
- Depth of field at f/813.6 m to 16.7 m (3.01 m)
- Hyperfocal at f/5.6214 m
- Hyperfocal at f/8150 m
- Circle of confusion0.019 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.