Index: image.php
===================================================================
--- image.php	(revision 17221)
+++ image.php	(working copy)
@@ -182,6 +182,21 @@
 }
 
 /**
+ * Convert the exif ISO Speed Ratings to a string.
+ *
+ * @since 3.0.5
+ *
+ * @param $iso
+ * @return str
+ */
+function wp_exif_isospeedratings2str($iso) {
+	if( is_array( $iso ) )
+		$iso = implode( ',', $iso );
+
+	return utf8_encode( trim( $iso ) );
+}
+
+/**
  * Get extended image metadata, exif or iptc as available.
  *
  * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
@@ -297,7 +312,7 @@
 		if ( ! empty($exif['FocalLength'] ) )
 			$meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
 		if ( ! empty($exif['ISOSpeedRatings'] ) )
-			$meta['iso'] = utf8_encode( trim( $exif['ISOSpeedRatings'] ) );
+			$meta['iso'] = wp_exif_isospeedratings2str( $exif['ISOSpeedRatings'] );
 		if ( ! empty($exif['ExposureTime'] ) )
 			$meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
 	}