Fujifilm X-T3 Diffraction Limit
With a 720 nm infrared filter, the Fujifilm X-T3 stays free of visible diffraction up to ƒ/4.5, and diffraction starts to soften images at ƒ/7.1. Unconverted (hot mirror), it is diffraction-free up to ƒ/6.3 and soft from ƒ/10.1. These limits come from its 3.77 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-T3 in the calculator
Fujifilm X-T3 specifications
- Pixel pitch: 3.77 μm
- Megapixels: 26.1
- Pixels: 6240 × 4160
- Sensor: APS-C, 23.5 × 15.6 mm
Buy the Fujifilm X-T3: 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/7.1 |
| 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/7.1 |
| 550 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 590 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 665 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 720 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 780 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 830 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 930 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| 1000 nm high-pass | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| IR Chrome | ƒ/4.5 | ƒ/5.6 | ƒ/7.1 |
| UV Bandpass | ƒ/11 | ƒ/14.3 | ƒ/18 |
Diffraction ratio at each ƒ-stop
The Airy disk diameter divided by the 3.77 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 | 0.32 | 0.36 | 0.43 | 0.5 | 0.53 | 0.6 | 0.65 | 0.71 | 0.75 | 0.84 | 0.91 |
| ƒ/2 | 0.45 | 0.52 | 0.61 | 0.71 | 0.76 | 0.86 | 0.93 | 1.01 | 1.07 | 1.2 | 1.29 |
| ƒ/2.8 | 0.63 | 0.72 | 0.85 | 1 | 1.07 | 1.21 | 1.3 | 1.41 | 1.5 | 1.69 | 1.81 |
| ƒ/4 | 0.91 | 1.04 | 1.22 | 1.42 | 1.53 | 1.72 | 1.86 | 2.02 | 2.15 | 2.41 | 2.59 |
| ƒ/5.6 | 1.27 | 1.45 | 1.7 | 1.99 | 2.14 | 2.41 | 2.61 | 2.83 | 3.01 | 3.37 | 3.62 |
| ƒ/8 | 1.81 | 2.07 | 2.43 | 2.85 | 3.05 | 3.44 | 3.73 | 4.04 | 4.3 | 4.82 | 5.18 |
| ƒ/11 | 2.49 | 2.85 | 3.35 | 3.92 | 4.2 | 4.73 | 5.13 | 5.55 | 5.91 | 6.62 | 7.12 |
| ƒ/16 | 3.62 | 4.14 | 4.87 | 5.7 | 6.11 | 6.89 | 7.46 | 8.08 | 8.6 | 9.63 | 10.36 |
| ƒ/22 | 4.98 | 5.7 | 6.69 | 7.83 | 8.4 | 9.47 | 10.25 | 11.11 | 11.82 | 13.24 | 14.24 |
| ƒ/32 | 7.25 | 8.28 | 9.73 | 11.39 | 12.22 | 13.77 | 14.91 | 16.15 | 17.19 | 19.26 | 20.71 |
| 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-T3. The same pixel pitch gives the same diffraction limits.
- Fujifilm X-E4 (3.77 μm)
- Fujifilm X-H2S (3.77 μm)
- Fujifilm X-M5 (3.77 μm)
- Fujifilm X-Pro3 (3.77 μm)
- Fujifilm X-S10 (3.77 μm)
- Fujifilm X-S20 (3.77 μm)
Pixel pitch comes from the camera database. Send a correction if anything here is wrong.