diff --git a/src/toolbox_scs/constants.py b/src/toolbox_scs/constants.py
index 55a6a3829f29961feaab2e61453a8936ad6b89ef..edafd1df78ac6e512b503e8cce7d92113da0b6ef 100644
--- a/src/toolbox_scs/constants.py
+++ b/src/toolbox_scs/constants.py
@@ -319,6 +319,9 @@ mnemonics = {
     "PP800_FocusLens": ({'source': 'SCS_ILH_LAS/MOTOR/LT_SPARE1',
                          'key': 'actualPosition.value',
                          'dim': None},),
+    "FFT_FocusLens": ({'source': 'SCS_CDIFFT_FDM/MOTOR/BARLOW_1',
+                       'key': 'actualPosition.value',
+                       'dim': None},),
     # 1st lens of telescope (setup of August 2019)
     "PP800_TeleLens": ({'source': 'SCS_ILH_LAS/MOTOR/LT7',
                         'key': 'actualPosition.value',