Removed default value fuckery. The matching class wil have to provide proper values.

functions.py

@@ -107,9 +107,9 @@ class Exif:
     Exif-Comment that has been written (incl. radiation)
     '''
 
-    def __init__(self, photo, dry_run, radiation=False, latitude=False, longitude=False, elevation=False):
-        self.write_exif = self._write_exif(photo, radiation, latitude,
-                                           longitude, elevation, dry_run)
+    def __init__(self, photo, dry_run, radiation, latitude, longitude, elevation):
+        self.write_exif = self._write_exif(photo, dry_run, radiation, latitude,
+                                           longitude, elevation)
  
     def __repr__(self):
         return 'Position: %s, %s: %s ' % self.write_exif
@@ -133,7 +133,7 @@ class Exif:
         metadata = pyexiv2.ImageMetadata(photo)
         metadata.read()
 
-        if latitude or longitude:
+        if latitude and longitude:
             latitude_degree = self._to_degree(latitude, ["S", "N"])
             longitude_degree = self._to_degree(longitude, ["W", "E"])
 
@@ -163,7 +163,7 @@ class Exif:
 
         if radiation:
             # Set new UserComment
-            new_comment = 'Radiation ☢ ' + str(radiation) + ' µS/h'
+            new_comment = 'Radiation ☢ : ' + str(radiation) + ' µS/h'
             metadata['Exif.Photo.UserComment'] = new_comment
         else:
             new_comment = None