This talk summarizes the recalibration of the GlueX active collimator using data collected during a scan of the primary collimator in x and y across the beam, collected on February 16, 2018. The results are compared with Monte Carlo estimates for how the transmitted flux should depend on the offset between the primary collimator and the photon beam axis. The simulation is used to predict the accuracy that could be obtained in the virtual spot distribution using a raster of the beam across the collimator in x and y.
