diff --git a/config/imsim/calibrateImage.py b/config/imsim/calibrateImage.py
new file mode 100644
index 000000000..e5a792ac2
--- /dev/null
+++ b/config/imsim/calibrateImage.py
@@ -0,0 +1,38 @@
+"""
+ImSim-specific overrides for CalibrateImageTask
+"""
+import os
+
+config_dir = os.path.join(os.path.dirname(__file__))
+
+# imsim background model is a single value per detector.
+config.psf_detection.background.approxOrderX: 1
+config.psf_detection.tempLocalBackground.approxOrderX: 1
+config.psf_detection.tempWideBackground.approxOrderX: 1
+config.psf_repair.cosmicray.background.approxOrderX: 1
+config.star_detection.background.approxOrderX = 1
+config.star_detection.tempLocalBackground.approxOrderX = 1
+config.star_detection.tempWideBackground.approxOrderX = 1
+
+# imSim-specifc reference catalogs
+config.connections.astrometry_ref_cat = "cal_ref_cat_2_2"
+config.connections.photometry_ref_cat = "cal_ref_cat_2_2"
+# Use the ImSim filterMap ("lsst_X_smeared" reference fluxes).
+config.astrometry_ref_loader.load(os.path.join(config_dir, 'filterMap.py'))
+config.astrometry_ref_loader.anyFilterMapsToThis = None
+config.photometry_ref_loader.load(os.path.join(config_dir, 'filterMap.py'))
+
+# Make sure galaxies from truth catalog are not used for calibration.
+config.astrometry.referenceSelector.doUnresolved = True
+config.astrometry.referenceSelector.unresolved.name = "resolved"
+config.astrometry.referenceSelector.unresolved.minimum = None
+config.astrometry.referenceSelector.unresolved.maximum = 0.5
+config.photometry.match.referenceSelection.doUnresolved = True
+config.photometry.match.referenceSelection.unresolved.name = "resolved"
+config.photometry.match.referenceSelection.unresolved.minimum = None
+config.photometry.match.referenceSelection.unresolved.maximum = 0.5
+
+# Only use brighter sources from the very deep truth catalog.
+config.photometry.match.referenceSelection.doMagLimit = True
+config.photometry.match.referenceSelection.magLimit.fluxField = "lsst_i_smeared_flux"
+config.photometry.match.referenceSelection.magLimit.maximum = 22.0
diff --git a/config/imsim/isr.py b/config/imsim/isr.py
index 6b7d50572..a93582868 100644
--- a/config/imsim/isr.py
+++ b/config/imsim/isr.py
@@ -22,5 +22,5 @@
 """
 imsim-specific overrides for IsrTask
 """
-config.doCrosstalk = True
+config.connections.newBFKernel = "bfk" 
 config.doBrighterFatter = True