diff --git a/ObservationSim/ObservationSim.py b/ObservationSim/ObservationSim.py
index c382fa638cfaeb61f682feb0d4afb44e6be06d2a..22cef071afe26921c7467944b409a0641497e4f7 100755
--- a/ObservationSim/ObservationSim.py
+++ b/ObservationSim/ObservationSim.py
@@ -162,6 +162,15 @@ class Observation(object):
             chip_output.create_output_file()
             self.nobj = len(self.cat.objs)
 
+            for ifilt in range(len(self.all_filter)):
+                temp_filter = self.all_filter[ifilt]
+                # Update the limiting magnitude using exposure time in pointing
+                temp_filter.update_limit_saturation_mags(exptime=pointing.exp_time, chip=chip)
+
+                # Select cutting band filter for saturation/limiting magnitude
+                if temp_filter.filter_type.lower() == self.config["obs_setting"]["cut_in_band"].lower():
+                    cut_filter = temp_filter
+
             # Loop over objects
             missed_obj = 0
             bright_obj = 0
@@ -190,20 +199,12 @@ class Observation(object):
                         target_filt=filt, 
                         norm_filt=norm_filt,
                     )
-                    for ifilt in range(len(self.all_filter)):
-                        temp_filter = self.all_filter[ifilt]
-                        _, obj.param["mag_%s"%temp_filter.filter_type] = self.cat.convert_sed(
-                            mag=obj.param["mag_use_normal"],
-                            sed=sed_data,
-                            target_filt=temp_filter, 
-                            norm_filt=norm_filt,
-                        )
-                        # Update the limiting magnitude using exposure time in pointing
-                        temp_filter.update_limit_saturation_mags(exptime=pointing.exp_time, chip=chip)
-
-                        # Select cutting band filter for saturation/limiting magnitude
-                        if temp_filter.filter_type.lower() == self.config["obs_setting"]["cut_in_band"].lower():
-                            cut_filter = temp_filter
+                    _, obj.param["mag_%s"%cut_filter.filter_type] = self.cat.convert_sed(
+                        mag=obj.param["mag_use_normal"],
+                        sed=sed_data,
+                        target_filt=cut_filter, 
+                        norm_filt=norm_filt,
+                    )
 
                 except Exception as e:
                     print(e)