Index: wp-content/themes/twentythirteen/css/ie.css
===================================================================
--- wp-content/themes/twentythirteen/css/ie.css	(revision 23947)
+++ wp-content/themes/twentythirteen/css/ie.css	(working copy)
@@ -117,10 +117,16 @@
 	width: auto;
 }
 
+.ie8 .gallery-item,
 .ie8 .gallery img {
 	max-width: none;
 }
 
+.ie8 .gallery-caption {
+	background: black;
+	filter: alpha(opacity=70);
+}
+
 .ie8 .sidebar .entry-header,
 .ie8 .sidebar .entry-content,
 .ie8 .sidebar .entry-summary,