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The original FLAMINGOS J, H, Ks and K filters were fabricated by OCLI as part of a consortium purchase and were loaned from NOAO. In 2003, the J, H, and Ks filters were replaced by Barr filters, which have similar, but not identical, characteristics. Barr provided wavelength scans at both ambient (300 K) and cryogenic (77 K) temperatures. The OCLI K filter had been provided with only cryogenic tracings. The spectroscopic order separator JH and HK filters were later purchased from Janos, but were scanned only at ambient temperature. In May 2008, all of the filters were removed as part of maintenance on the mechanism and traced on the NOAO Lambda-9 spectrometer at ambient temperature. These results are summarized on the filter plots on the following links, which are color coded black (vendor ambient temperature), red (vendor cryogenic temperature), and green (NOAO ambient temperature). The small offset between the NOAO and vendor ambient plots may represent a suspected offset in the Lambda-9 zero point and not a real shift in the filter properties. Only the NOAO ambient plots are provided for the JH and HK filters, since they were never scanned at cryogenic temperatures.
| Position | Motor Position | Name | cuton | cutoff |
| 0 | 0 | J | 1.170 | 1.326 |
| 1 | 208 | H | 1.495 | 1.776 |
| 2 | 417 | K | 2.028 | 2.365 |
| 3 | 625 | HK | 1.37 | 2.6 |
| 4 | 833 | JH | 0.947 | 1.870 |
| 5 | 1042 | Ks | 1.990 | 2.305 |
