Fujifilm X-T2 Diffraction Limit
With a 720 nm infrared filter, the Fujifilm X-T2 stays free of visible diffraction up to ƒ/4.5, and diffraction starts to soften images at ƒ/8. Unconverted (hot mirror), it is diffraction-free up to ƒ/6.3 and soft from ƒ/10.1. These limits come from its 3.93 μm pixel pitch: longer infrared wavelengths make a larger Airy disk, so diffraction appears at wider apertures than in visible light.
Open the Fujifilm X-T2 in the calculator
Fujifilm X-T2 specifications
- Pixel pitch: 3.93 μm
- Megapixels: 24.3
- Pixels: 6000 × 4000
- Sensor: APS-C, 23.6 × 15.6 mm
Buy the Fujifilm X-T2: KEH Adorama B&H
Sharpest ƒ-stop by filter
Safe is the narrowest aperture with a diffraction ratio of 3 or lower at every wavelength the filter passes. Caution allows up to 3.75. Avoid is the first aperture where any wavelength reaches 4.5. All three are calculated to the one-third stop. See which wavelengths each filter passes.
| Filter | Safe | Caution | Avoid |
|---|---|---|---|
| Full spectrum | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| Hot mirror or UV/IR cut | ƒ/6.3 | ƒ/8 | ƒ/10.1 |
| 470 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 550 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 590 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 665 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 720 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 780 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 830 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 930 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| 1000 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| IR Chrome | ƒ/4.5 | ƒ/5.6 | ƒ/8 |
| UV Bandpass | ƒ/11 | ƒ/14.3 | ƒ/20.2 |
Diffraction ratio at each ƒ-stop
The Airy disk diameter divided by the 3.93 μm pixel pitch, for every wavelength from ultraviolet to infrared. A filter only passes some of these wavelengths; the table above applies each filter’s set. How the ratio is calculated.
| ƒ-stop | 350 nm | 400 nm | 470 nm | 550 nm | 590 nm | 665 nm | 720 nm | 780 nm | 830 nm | 930 nm | 1000 nm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ƒ/1.4 | 0.3 | 0.35 | 0.41 | 0.48 | 0.51 | 0.58 | 0.63 | 0.68 | 0.72 | 0.81 | 0.87 |
| ƒ/2 | 0.43 | 0.5 | 0.58 | 0.68 | 0.73 | 0.83 | 0.89 | 0.97 | 1.03 | 1.15 | 1.24 |
| ƒ/2.8 | 0.61 | 0.7 | 0.82 | 0.96 | 1.03 | 1.16 | 1.25 | 1.36 | 1.44 | 1.62 | 1.74 |
| ƒ/4 | 0.87 | 0.99 | 1.17 | 1.37 | 1.47 | 1.65 | 1.79 | 1.94 | 2.06 | 2.31 | 2.48 |
| ƒ/5.6 | 1.22 | 1.39 | 1.63 | 1.91 | 2.05 | 2.31 | 2.5 | 2.71 | 2.89 | 3.23 | 3.48 |
| ƒ/8 | 1.74 | 1.99 | 2.33 | 2.73 | 2.93 | 3.3 | 3.58 | 3.87 | 4.12 | 4.62 | 4.97 |
| ƒ/11 | 2.39 | 2.73 | 3.21 | 3.76 | 4.03 | 4.54 | 4.92 | 5.33 | 5.67 | 6.35 | 6.83 |
| ƒ/16 | 3.48 | 3.97 | 4.67 | 5.46 | 5.86 | 6.61 | 7.15 | 7.75 | 8.25 | 9.24 | 9.93 |
| ƒ/22 | 4.78 | 5.46 | 6.42 | 7.51 | 8.06 | 9.08 | 9.83 | 10.65 | 11.34 | 12.7 | 13.66 |
| ƒ/32 | 6.95 | 7.95 | 9.34 | 10.93 | 11.72 | 13.21 | 14.3 | 15.5 | 16.49 | 18.48 | 19.87 |
| No visible diffraction (less than 3) | |
| Visible diffraction may slightly impact image sharpness (3 to 4.5) | |
| Visible diffraction will impact image sharpness (4.5 or greater) |
Cameras with similar pixel pitch
Other APS-C cameras within 0.2 μm of the Fujifilm X-T2. The same pixel pitch gives the same diffraction limits.
- Fujifilm X-Pro2 (3.93 μm)
- Fujifilm X100F (3.93 μm)
- Fujifilm X-A3 (3.92 μm)
- Fujifilm X-A5 (3.92 μm)
- Fujifilm X-E3 (3.92 μm)
- Fujifilm X-H1 (3.92 μm)
Pixel pitch comes from the camera database. Send a correction if anything here is wrong.