diff --git a/contrib/cr2hdr.lua b/contrib/cr2hdr.lua
new file mode 100644
index 0000000..e6bc214
--- /dev/null
+++ b/contrib/cr2hdr.lua
@@ -0,0 +1,113 @@
+--[[
+    Copyright (C) 2015 Till Theato <theato@ttill.de>.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+]]
+--[[
+cr2hdr Magic Lantern Dual ISO processing.
+
+This script automates the steps involved to process an image created
+with the Magic Lantern Dual ISO module. Upon invoking the script with a
+shortcut "cr2hdr" provided by Magic Lantern is run on the selected
+images. The processed files are imported. They are also made group
+leaders to hide the original files.
+
+ADDITIONAL SOFTWARE NEEDED FOR THIS SCRIPT
+* cr2hdr (sources can be obtained through the Magic Lantern repository)
+
+USAGE
+* require this script from your main lua file
+* trigger conversion on selected/hovered images by shortcut (set shortcut in settings dialog)
+* it is also possible to have the script run after importing a collection (optin, since it is not that fast)
+]]
+
+local darktable = require "darktable"
+
+-- Tested with darktable 1.6.2
+darktable.configuration.check_version(...,{2,0,2})
+
+local queue = {}
+local processed_files = {}
+local job
+
+local function file_imported(event, image)
+    local filename = image.path .. "/" .. image.filename
+    if processed_files[filename] then
+        image.make_group_leader(image)
+        processed_files[filename] = false
+    else
+        if darktable.preferences.read("cr2hdr", "onimport", "bool") then
+            table.insert(queue, image)
+        end
+    end
+end
+
+local function stop_conversion(job)
+    job.valid = false
+end
+
+local function convert_image(image)
+    if string.sub(image.filename, -3) == "CR2" then
+        local filename = image.path .. "/" .. image.filename
+        local result = coroutine.yield("RUN_COMMAND", "cr2hdr " .. filename)
+        local out_filename = string.gsub(filename, ".CR2", ".DNG")
+        local file = io.open(out_filename)
+        if file then
+            file:close()
+            processed_files[out_filename] = true
+            darktable.database.import(out_filename)
+        else
+            darktable.print_error(filename .. ": cr2hdr failed.")
+        end
+    else
+        darktable.print_error(image.filename .. " is not a Canon RAW.")
+    end
+end
+
+local function convert_images()
+    if next(queue) == nil then return end
+
+    job = darktable.gui.create_job("Dual ISO conversion", true, stop_conversion)
+    for key,image in pairs(queue) do
+        if job.valid then
+            job.percent = (key-1)/#queue
+            convert_image(image)
+        else
+            break
+        end
+    end
+    local success_count = 0
+    for _ in pairs(processed_files) do success_count = success_count + 1 end
+    darktable.print("Dual ISO conversion successful on " .. success_count .. "/" .. #queue .. " images.")
+    job.valid = false
+    processed_files = {}
+    queue = {}
+end
+
+local function film_imported(event, film)
+    if darktable.preferences.read("cr2hdr", "onimport", "bool") then
+        convert_images()
+    end
+end
+
+local function convert_action_images(shortcut)
+    queue = darktable.gui.action_images
+    convert_images()
+end
+
+darktable.register_event("shortcut", convert_action_images, "Run cr2hdr (Magic Lantern DualISO converter) on selected images")
+darktable.register_event("post-import-image", file_imported)
+darktable.register_event("post-import-film", film_imported)
+
+darktable.preferences.register("cr2hdr", "onimport", "bool", "Invoke on import", "If true then cr2hdr will try to proccess every file during importing. Warning: cr2hdr is quite slow even in figuring out on whether the file is Dual ISO or not.", false)