what is the filter when the wavelength is 222mm (k-band)?
CREATE TABLE "observations_made_of_the_hdf_s_with_the_" (
  "camera" text,
  "filter" text,
  "wavelength" text,
  "total_exposure_time" text,
  "exposures" real
);
SELECT "filter" FROM "observations_made_of_the_hdf_s_with_the_" WHERE "wavelength"='222mm (K-band)';