Filters Transmission

Here are the as scanned transmission curves for the NIRISS filters. Most of these filters (except F158,F380,F430,F480) used to be NIRCam spares which moved to NIRISS when TFI died to become NIRISS. The “blue” filters (F200 and less) are positioned on the Pupil Wheel and lack blocking beyond 2.5 microns. They are therefore stacked with a  blocking filter to cut off the >2.5 micron wavelengths. The “red” filters are positioned in the Filter Wheel and cover the whole detector sensitivity domain, so don’t require a separate blocking filter.