diff --git a/PIL/TiffImagePlugin.py b/PIL/TiffImagePlugin.py
index 1b60e8016..b9dd19a61 100644
--- a/PIL/TiffImagePlugin.py
+++ b/PIL/TiffImagePlugin.py
@@ -1784,14 +1784,14 @@ class AppendingTiffWriter:
 def _save_all(im, fp, filename):
     encoderinfo = im.encoderinfo.copy()
     encoderconfig = im.encoderconfig
-    append_images = encoderinfo.get("append_images", [])
+    append_images = list(encoderinfo.get("append_images", []))
     if not hasattr(im, "n_frames") and not append_images:
         return _save(im, fp, filename)
 
     cur_idx = im.tell()
     try:
         with AppendingTiffWriter(fp) as tf:
-            for ims in itertools.chain([im], append_images):
+            for ims in [im]+append_images:
                 ims.encoderinfo = encoderinfo
                 ims.encoderconfig = encoderconfig
                 if not hasattr(ims, "n_frames"):