diff --git a/README.md b/README.md
index fbf5aa6..5c56b3a 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # dtlua -- darktable lua scripts
 
+`add_lens_info`: script to add manual lens info. from [[https://discuss.pixls.us/t/add-lens-information-in-darktable/45262/19|pixls.us]]
 * `cr2hdr`: the `contrib/cr2hdr` script from [[https://github.com/darktable-org/lua-scripts|lua-scripts]], but with a locale fix
 * `ext_proc`: external processing with arbitrary command
 * `open_ooc`: open associated ooc jpegs for selected raw files
diff --git a/add_lens_info.lua b/add_lens_info.lua
new file mode 100644
index 0000000..a043428
--- /dev/null
+++ b/add_lens_info.lua
@@ -0,0 +1,366 @@
+--[[
+
+    add_lens_info.lua - add user specifed lens information to exif_lens field
+
+    Copyright (C) 2025 Bill Ferguson <wpferguson@gmail.com>.
+
+    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/>.
+]]
+--[[
+    add_lens_info - add user specifed lens information to exif_lens field
+
+    apply_lens_info takes user specified lens information strings and applies
+    them to the image database entries in darktable.
+
+    ADDITIONAL SOFTWARE NEEDED FOR THIS SCRIPT
+    none
+
+    USAGE
+    * start script from script manager
+    * add lens information string and save it
+    * select lens information string in module
+    * select image(s) to apply the lens information to
+    * click apply lens information button, or use shortcut to apply the change
+
+    BUGS, COMMENTS, SUGGESTIONS
+    Bill Ferguson <wpferguson@gmail.com>
+
+    CHANGES
+]]
+
+local dt = require "darktable"
+local du = require "lib/dtutils"
+-- local df = require "lib/dtutils.file"
+-- local ds = require "lib/dtutils.string"
+-- local dtsys = require "lib/dtutils.system"
+local log = require "lib/dtutils.log"
+-- local debug = require "darktable.debug"
+
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- C O N S T A N T S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+local MODULE <const> = "add_lens_info"
+local DEFAULT_LOG_LEVEL <const> = log.warn
+local TMP_DIR <const> = dt.configuration.tmp_dir
+
+-- path separator
+local PS <const> = dt.configuration.running_os == "windows" and "\\" or "/"
+
+-- command separator
+local CS <const> = dt.configuration.running_os == "windows" and "&" or ";"
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- A P I  C H E C K
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+du.check_min_api_version("7.0.0", MODULE)   -- choose the minimum version that contains the features you need
+
+
+-- - - - - - - - - - - - - - - - - - - - - - - - - -
+-- I 1 8 N
+-- - - - - - - - - - - - - - - - - - - - - - - - - -
+
+local gettext = dt.gettext.gettext
+
+local function _(msgid)
+    return gettext(msgid)
+end
+
+
+-- - - - - - - - - - - - - - - - - - - - - - - - - -
+-- S C R I P T  M A N A G E R  I N T E G R A T I O N
+-- - - - - - - - - - - - - - - - - - - - - - - - - -
+
+local script_data = {}
+
+script_data.destroy = nil           -- function to destory the script
+script_data.destroy_method = nil    -- set to hide for libs since we can't destroy them commpletely yet
+script_data.restart = nil           -- how to restart the (lib) script after it's been hidden - i.e. make it visible again
+script_data.show = nil              -- only required for libs since the destroy_method only hides them
+
+script_data.metadata = {
+  name = _("add lens info"),         -- visible name of script
+  purpose = _("add user specifed lens information to exif_lens field"),   -- purpose of script
+  author = "Bill Ferguson <wpferguson@gmail.com>",   -- your name and optionally e-mail address
+  help = ""                   -- URL to help/documentation
+}
+
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- L O G  L E V E L
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+log.log_level(DEFAULT_LOG_LEVEL)
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- N A M E  S P A C E
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+local add_lens_info = {}
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- G L O B A L  V A R I A B L E S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+-- the lenses we know about
+add_lens_info.lenses = {}
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- P R E F E R E N C E S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+-- lens data is stored in a string in the darktablerc file
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- A L I A S E S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+local namespace = add_lens_info
+local ali = add_lens_info
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- F U N C T I O N S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+local function read_lens_preferences()
+  local lenses = dt.preferences.read(MODULE, "lenses", "string")
+  if string.len(lenses) > 1 then
+    if string.match(lenses, ".+$.+") then
+      ali.lenses = du.split(lenses, '%$')
+    else
+      table.insert(ali.lenses, lenses)
+    end
+  end
+end
+
+local function save_lens_preferences()
+  dt.preferences.write(MODULE, "lenses", "string", table.concat(ali.lenses, '$'))
+end
+
+local function set_buttons_sensitive()
+  if #dt.gui.action_images > 0 then
+    ali.apply_lens_selection.sensitive = true
+    dt.gui.libs.image.set_sensitive(MODULE, true)
+  else
+    ali.apply_lens_selection.sensitive = false
+    dt.gui.libs.image.set_sensitive(MODULE, false)
+  end
+end
+
+local function apply_lens_name()
+  local images = dt.gui.action_images
+
+  dt.print_log("image count is " .. #images)
+
+  for _, image in ipairs(images) do
+    image.exif_lens = ali.lenses[ali.select_lens_name.selected]
+  end
+end
+
+local function install_module()
+  if not namespace.module_installed then
+    dt.register_lib(
+      MODULE,     -- Module name
+      script_data.metadata.name,     -- Visible name
+      true,                -- expandable
+      false,               -- resetable
+      {[dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 400}},   -- containers
+      namespace.main_widget,
+      nil,-- view_enter
+      nil -- view_leave
+    )
+    namespace.module_installed = true
+  end
+end
+
+local function update_combobox_choices(combobox, choice_table, selected)
+  local items = #combobox
+  local choices = #choice_table
+  for i, name in ipairs(choice_table) do 
+    combobox[i] = name
+  end
+  if choices < items then
+    for j = items, choices + 1, -1 do
+      combobox[j] = nil
+    end
+  end
+  combobox.value = selected
+end
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- U S E R  I N T E R F A C E
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+ali.stack_selector = dt.new_widget("combobox"){
+  tooltip = "choose to add a lens or select the lens name to be applied",
+  selected = dt.preferences.read(MODULE, "selector", "integer") > 0 and dt.preferences.read(MODULE, "selector", "integer") or 1,
+  _("add new lens name"),
+  _("select lens name"),
+  changed_callback = function(this)
+    dt.preferences.write(MODULE, "selector", "integer", this.selected)
+    if ali.module_installed then
+      ali.stack.active = this.selected
+    end
+  end
+}
+
+ali.lens_name = dt.new_widget("entry"){
+  placeholder = _("lens name/identification"),
+  text = ""
+}
+
+ali.add_lens = dt.new_widget("button"){
+  label = _("add new lens"),
+  tooltip = _("add new lens string to choices"),
+  clicked_callback = function(this)
+    table.insert(ali.lenses, ali.lens_name.text)
+    table.sort(ali.lenses)
+    local new_lens_place
+    for i, lens_name in ipairs(ali.lenses) do
+      if ali.lens_name.text == lens_name then
+        new_lens_place = i
+        break
+      end
+    end
+    update_combobox_choices(ali.select_lens_name, ali.lenses, new_lens_place)
+    ali.lens_name.text = ""
+    save_lens_preferences()
+  end
+}
+
+ali.add_new_lens = dt.new_widget("box"){
+  orientation = "vertical",
+  dt.new_widget("label"){ label = _("add new lens") },
+  ali.lens_name,
+  ali.add_lens
+}
+
+ali.select_lens_name = dt.new_widget("combobox"){
+  tooltip = _("select lens name to apply to images"),
+}
+read_lens_preferences()
+if #ali.lenses > 0 then
+  update_combobox_choices(ali.select_lens_name, ali.lenses, 1)
+end
+
+ali.apply_lens_selection = dt.new_widget("button"){
+  label = _("apply lens name"),
+  tooltip = _("apply lens name to selected images"),
+  sensitive = false,
+  clicked_callback = function(this)
+    apply_lens_name()
+  end
+}
+
+ali.select_lens = dt.new_widget("box"){
+  orientation = "vertical",
+  dt.new_widget("label"){ label = _("select lens name to apply") },
+  ali.select_lens_name,
+  ali.apply_lens_selection
+}
+
+ali.stack = dt.new_widget("stack"){
+  ali.add_new_lens,
+  ali.select_lens,
+  active = 1
+}
+
+ali.stack_selector = dt.new_widget("combobox"){
+  tooltip = "choose to add a lens or select the lens name to be applied",
+  selected = dt.preferences.read(MODULE, "selector", "integer") > 0 and dt.preferences.read(MODULE, "selector", "integer") or 1,
+  _("add new lens name"),
+  _("select lens name"),
+  changed_callback = function(this)
+    dt.preferences.write(MODULE, "selector", "integer", this.selected)
+    if ali.module_installed then
+      ali.stack.active = this.selected
+    else
+      ali.stack.active = dt.preferences.read(MODULE, "selector", "integer")
+    end
+  end
+}
+
+ali.main_widget = dt.new_widget("box"){
+  orientation = "vertical",
+  ali.stack_selector,
+  ali.stack
+}
+
+dt.gui.libs.image.register_action(MODULE, _("apply lens name"), apply_lens_name, _("apply lens name from apply lens info module to selected images"))
+dt.gui.libs.image.set_sensitive(MODULE, false)
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- M A I N  P R O G R A M
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+read_lens_preferences()
+
+if dt.gui.current_view().id == "lighttable" then
+  install_module()
+else
+  if not namespace.event_registered then
+    dt.register_event(MODULE, "view-changed",
+      function(event, old_view, new_view)
+        if new_view.name == "lighttable" and old_view.name == "darkroom" then
+          install_module()
+         end
+      end
+    )
+    namespace.event_registered = true
+  end
+end
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- D A R K T A B L E  I N T E G R A T I O N 
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+local function destroy()
+  dt.gui.libs[MODULE].visible = false
+
+  if namespace.event_registered then
+    dt.destroy_event(MODULE, "view-changed")
+  end
+  
+  return
+end
+
+local function restart()
+  dt.gui.libs[MODULE].visible = true
+
+  return
+end
+
+script_data.destroy = destroy
+script_data.restart = restart
+script_data.destroy_method = "hide"
+script_data.show = restart
+
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+-- E V E N T S
+-- - - - - - - - - - - - - - - - - - - - - - - - 
+
+dt.register_event(MODULE, "shortcut",
+  function(event, shortcut)
+    apply_lens_name()
+  end, _("apply lens name")
+)
+
+dt.register_event(MODULE, "selection-changed",
+  function(event)
+    set_buttons_sensitive()
+  end
+)
+
+return script_data