diff --git a/SimPEG/Survey.py b/SimPEG/Survey.py
index a6acd1a5..276beebf 100644
--- a/SimPEG/Survey.py
+++ b/SimPEG/Survey.py
@@ -250,6 +250,16 @@ class Fields(object):
             ind = np.in1d(self.survey.txList, txTestList)
         return ind
 
+    def _nameIndex(self, name):
+
+        if type(name) is slice:
+            assert name == slice(None,None,None), 'Fancy field name slicing is not supported... yet.'
+            name = None
+
+        if name is not None and name not in self.knownFields:
+            raise KeyError('Invalid field name')
+        return name
+
     def _indexAndNameFromKey(self, key):
         if type(key) is not tuple:
             key = (key,)
@@ -259,10 +269,7 @@ class Fields(object):
         assert len(key) == 2, 'must be [Tx, fieldName]'
 
         txTestList, name = key
-
-        if name is not None and name not in self.knownFields:
-            raise KeyError('Invalid field name')
-
+        name = self._nameIndex(name)
         ind = self._txIndex(txTestList)
         return ind, name
 
@@ -328,9 +335,7 @@ class TimeFields(Fields):
 
         txTestList, name, timeInd = key
 
-        if name is not None and name not in self.knownFields:
-            raise KeyError('Invalid field name')
-
+        name = self._nameIndex(name)
         txInd = self._txIndex(txTestList)
 
         return (txInd, timeInd), name
diff --git a/SimPEG/Tests/test_Survey.py b/SimPEG/Tests/test_Survey.py
index 4c0b1a8a..1d4867ba 100644
--- a/SimPEG/Tests/test_Survey.py
+++ b/SimPEG/Tests/test_Survey.py
@@ -20,7 +20,7 @@ class DataAndFieldsTest(unittest.TestCase):
         txList = [Tx0,Tx1,Tx2,Tx3,Tx4]
         survey = Survey.BaseSurvey(txList=txList)
         self.D = Survey.Data(survey)
-        self.F = Survey.Fields(mesh, survey, knownFields={'phi':'CC','e':'E','b':'F'})
+        self.F = Survey.Fields(mesh, survey, knownFields={'phi':'CC','e':'E','b':'F'}, dtype={"phi":float,"e":complex,"b":complex})
         self.Tx0 = Tx0
         self.Tx1 = Tx1
         self.mesh = mesh
@@ -49,9 +49,9 @@ class DataAndFieldsTest(unittest.TestCase):
     def test_SetGet(self):
         F = self.F
         nTx = F.survey.nTx
-        e = np.random.rand(F.mesh.nE, nTx)
+        e = np.random.rand(F.mesh.nE, nTx) + np.random.rand(F.mesh.nE, nTx)*1j
         F[:, 'e'] = e
-        b = np.random.rand(F.mesh.nF, nTx)
+        b = np.random.rand(F.mesh.nF, nTx) + np.random.rand(F.mesh.nF, nTx)*1j
         F[:, 'b'] = b
 
         self.assertTrue(np.all(F[:, 'e'] == e))
@@ -72,7 +72,7 @@ class DataAndFieldsTest(unittest.TestCase):
         F[[self.Tx0,self.Tx1], 'phi'] = phi
         self.assertTrue(np.all(F[[self.Tx0,self.Tx1], 'phi'] == phi))
 
-        fdict = F[:]
+        fdict = F[:,:]
         self.assertTrue(type(fdict) is dict)
         self.assertTrue(sorted([k for k in fdict]) == ['b','e','phi'])