An example file is testdata_jointcal/hsc/SSP_WIDE/2015-07-15/01291/HSC-R/HSC-0034648-051.fits. This is technically an ImageF file, not an ExposureF file. Its header has a FILTER01 key mapping to "HSC-r". This key cannot be read by afw directly; it's translated to LSST conventions by the following code:
- lsst.astro_metadata_translator.SuprimeCamTranslator and HscTranslator
Note that lst.obs.subaru.HscMapper does nothing special with the filters, besides encoding the data ID filter in the exposureID.
Since HscParseTask only affects the Butler registry, and not the individual files, I'm not clear at what point in the Gen 2 processing is the file supposed to have an "HSC-R" filter – unless it's in the very code that
DM-27178 modified to print the above warning message.