There is a focus offset for different filters in Omega-prime because their different thickness.
| filter | central wavelength (µm) | focus offset with J (mm) |
|---|---|---|
| J | 1.25 | 0.000 |
| H | 1.65 | -0.113 |
| Km = K' | 2.10 | -1.362 |
| Ks | 2.16 | -1.420 |
| K | 2.20 | -0.623 |
| H-short | 1.56 | -0.778 |
| H-long | 1.77 | -0.507 |
| K-short | 2.08 | -1.997 |