diff --git a/graphene_django/converter.py b/graphene_django/converter.py
index c40313d..3b3e18d 100644
--- a/graphene_django/converter.py
+++ b/graphene_django/converter.py
@@ -71,7 +71,8 @@ def convert_django_field_with_choices(field, registry=None):
                 return named_choices_descriptions[self.name]
 
         enum = Enum(name, list(named_choices), type=EnumWithDescriptionsType)
-        converted = enum(description=field.help_text, required=not field.null)
+        required = not (field.blank or field.null or field.default)
+        converted = enum(description=field.help_text, required=required)
     else:
         converted = convert_django_field(field, registry)
     if registry is not None:
diff --git a/graphene_django/tests/test_types.py b/graphene_django/tests/test_types.py
index 8a8643b..5be1774 100644
--- a/graphene_django/tests/test_types.py
+++ b/graphene_django/tests/test_types.py
@@ -120,7 +120,7 @@ type Article implements Node {
   pubDateTime: DateTime!
   reporter: Reporter!
   editor: Reporter!
-  lang: ArticleLang!
+  lang: ArticleLang
   importance: ArticleImportance
 }
 
@@ -166,7 +166,7 @@ type Reporter {
   lastName: String!
   email: String!
   pets: [Reporter]
-  aChoice: ReporterAChoice!
+  aChoice: ReporterAChoice
   reporterType: ReporterReporterType
   articles(before: String, after: String, first: Int, last: Int): ArticleConnection
 }