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We use globular cluster data from the Resolved Stellar Populations EarlyRelease Science (ERS) program to validate the flux calibration for the NearInfrared Camera (NIRCam) on the James Webb Space Telescope (JWST). We find asignificant flux offset between the eight short wavelength detectors, rangingfrom 1-23% (about 0.01-0.2 mag) that affects all NIRCam imaging observations.We deliver improved zeropoints for the ERS filters and show that alternatezeropoints derived by the community also improve the calibration significantly.We also find that the detector offsets appear to be time variable by up to atleast 0.1 mag.

The JWST Resolved Stellar Populations Early Release Science Program I.: NIRCam Flux Calibration