Index: trunk/psModules/src/camera/pmFPAExtent.c
===================================================================
--- trunk/psModules/src/camera/pmFPAExtent.c	(revision 13655)
+++ trunk/psModules/src/camera/pmFPAExtent.c	(revision 19033)
@@ -25,6 +25,15 @@
 	pmHDU *hdu = pmHDUFromReadout (readout);
 	if (hdu && hdu->header) {
-	    xSize = psMetadataLookupS32(NULL, hdu->header, "NAXIS1");
-	    ySize = psMetadataLookupS32(NULL, hdu->header, "NAXIS2");
+	    bool status;
+	    xSize = psMetadataLookupS32(&status, hdu->header, "NAXIS1");
+	    if (!status) {
+		xSize = psMetadataLookupS32(&status, hdu->header, "IMNAXIS1");
+		if (!status) return NULL;
+	    }		
+	    ySize = psMetadataLookupS32(&status, hdu->header, "NAXIS2");
+	    if (!status) {
+		ySize = psMetadataLookupS32(&status, hdu->header, "IMNAXIS2");
+		if (!status) return NULL;
+	    }		
 	} else {
         // Don't have anything to base the true extent on, so have to give the hardwired value (largest possible extent)