What it frames
The Fujifilm GFX Eterna 55 with the Fujifilm GF 100-200mm f/5.6 R LM OIS WR, over a 1.75 m person in front of a wall with a window. 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 Medium format (44 x 33) sensor (43.8 x 32.9 mm) has a crop factor of 0.79, so the dashed frames are marked with the focal length that gives the same view on it.
100mm on the Fujifilm GFX Eterna 55 frames 66 cm × 49 cm at 1.5 m: like 79mm on full frame, 25° across.
The numbers
- Frame at 1.5 m66 cm × 49 cm
- Full-frame equivalent79mm
- Angle of view25° × 19°, 31° diagonal
- Depth of field at f/5.61.46 m to 1.54 m (8.6 cm)
- Depth of field at f/81.44 m to 1.56 m (12 cm)
- Hyperfocal at f/5.649 m
- Hyperfocal at f/834.3 m
- Circle of confusion0.037 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.