Index: trunk/ippScripts/scripts/stack_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/stack_skycell.pl	(revision 12053)
+++ trunk/ippScripts/scripts/stack_skycell.pl	(revision 12056)
@@ -34,8 +34,7 @@
 use Pod::Usage qw( pod2usage );
 
-my ($stack_id, $camera, $dbname, $workdir, $no_update, $no_op);
+my ($stack_id, $dbname, $workdir, $no_update, $no_op);
 GetOptions(
     'stack_id|d=s'      => \$stack_id, # Stack identifier
-    'camera|c=s'        => \$camera, # Camera name
     'dbname|d=s'        => \$dbname, # Database name
     'workdir|w=s'       => \$workdir,	# Working directory, for output files
@@ -46,10 +45,7 @@
 pod2usage( -msg => "Unknown option: @ARGV", -exitval => 2 ) if @ARGV;
 pod2usage(
-    -msg => "Required options: --stack_id --camera",
+    -msg => "Required options: --stack_id",
     -exitval => 3,
-) unless defined $stack_id
-    and defined $camera;
-
-$ipprc->define_camera($camera);
+	  ) unless defined $stack_id;
 
 # Look for programs we need
@@ -87,4 +83,5 @@
 my $inputList;			# List of input files
 my $skycell_id;			# Skycell identifier
+my $camera;			# Camera
 foreach my $file (@$files) {
     my $uri = $ipprc->convert_filename_absolute( $file->{uri} ); # URI for file
@@ -96,5 +93,12 @@
 	$skycell_id = $file->{skycell_id};
     }
-}
+    if (defined $camera) {
+	&my_die("Cameras don't match", $stack_id, $PS_EXIT_SYS_ERROR) unless $file->{camera} eq $camera;
+    } else {
+	$camera = $file->{camera};
+    }
+}
+$ipprc->define_camera($camera);
+
 
 ### Working directory