diff --git a/exif/exif.h b/exif/exif.h
index fdd7053..0d0d706 100644
--- a/exif/exif.h
+++ b/exif/exif.h
@@ -75,6 +75,7 @@ EXIF_API void exif_data_ref_sort_by_key(ExifDataRef* d);
 EXIF_API void exif_data_ref_sort_by_tag(ExifDataRef* d);
 EXIF_API ExifDataItor* exif_data_ref_iter(ExifDataRef* d);
 EXIF_API ExifDatumRef* exif_data_itor_next(ExifDataItor* itor);
+EXIF_API ExifDatumRef* exif_data_itor_next_back(ExifDataItor* itor);
 EXIF_API char* exif_datum_key(ExifDatumRef* d);
 EXIF_API ExifValueRef* exif_datum_value(ExifDatumRef *d);
 EXIF_API void exif_free_value(ExifValue* value);
diff --git a/exif/src/exif.cpp b/exif/src/exif.cpp
index 5cabeae..9de3513 100644
--- a/exif/src/exif.cpp
+++ b/exif/src/exif.cpp
@@ -358,7 +358,6 @@ ExifDataItor* exif_data_ref_iter(ExifDataRef* d) {
     auto re = new ExifDataItor;
     re->ref = (Exiv2::ExifData*)d;
     re->itor = re->ref->begin();
-    re->begin = re->ref->begin();
     re->end = re->ref->end();
     return re;
 }
@@ -376,6 +375,14 @@ ExifDatumRef* exif_data_itor_next(ExifDataItor* itor) {
     return (ExifDatumRef*)&data;
 }
 
+ExifDatumRef* exif_data_itor_next_back(ExifDataItor* itor) {
+    if (!itor->ref) return nullptr;
+    if (itor->itor == itor->end) return nullptr;
+    itor->end--;
+    auto& data = (*itor->end);
+    return (ExifDatumRef*)&data;
+}
+
 char* exif_datum_key(ExifDatumRef* d) {
     if (!d) return nullptr;
     auto data = (Exiv2::Exifdatum*)d;
diff --git a/exif/src/exif_priv.h b/exif/src/exif_priv.h
index 76f5205..cea32d7 100644
--- a/exif/src/exif_priv.h
+++ b/exif/src/exif_priv.h
@@ -19,7 +19,6 @@ typedef struct ExifDatum {
 } ExifDatum;
 typedef struct ExifDataItor {
     Exiv2::ExifData* ref;
-    Exiv2::ExifMetadata::const_iterator begin;
     Exiv2::ExifMetadata::const_iterator itor;
     Exiv2::ExifMetadata::const_iterator end;
 } ExifDataItor;
diff --git a/src/exif.rs b/src/exif.rs
index cf46e7d..248c057 100644
--- a/src/exif.rs
+++ b/src/exif.rs
@@ -16,7 +16,7 @@ use std::ffi::OsStr;
 use std::fs::copy;
 #[cfg(test)]
 use std::fs::create_dir;
-use std::iter::Iterator;
+use std::iter::{DoubleEndedIterator, Iterator};
 use std::marker::PhantomData;
 use std::ops::Deref;
 use std::ops::DerefMut;
@@ -829,6 +829,19 @@ impl<'a> Iterator for ExifDataItor<'a> {
     }
 }
 
+impl<'a> DoubleEndedIterator for ExifDataItor<'a> {
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.itor.is_null() {
+            return None;
+        }
+        let r = unsafe { _exif::exif_data_itor_next_back(self.itor) };
+        if r.is_null() {
+            return None;
+        }
+        Some(unsafe { ExifDatumRef::from_const_handle(r as *const ExifDatumRef) })
+    }
+}
+
 /// An image
 pub struct ExifImage {
     img: *mut _exif::ExifImage,
@@ -1057,6 +1070,16 @@ fn test_exif_data() {
     let f2 = i.next().unwrap();
     assert_eq!(f.key(), Some(String::from("Exif.Image.XPTitle")));
     assert_eq!(f2.key(), Some(String::from("Exif.Image.PageName")));
+    let mut i = d.iter().unwrap();
+    assert_eq!(
+        i.next_back().unwrap().key(),
+        Some(String::from("Exif.Image.PageName"))
+    );
+    assert_eq!(
+        i.next().unwrap().key(),
+        Some(String::from("Exif.Image.XPTitle"))
+    );
+    assert!(i.next().is_none());
 }
 
 #[test]