diff --git a/libraries/AP_Mount/AP_Mount_Topotek.cpp b/libraries/AP_Mount/AP_Mount_Topotek.cpp
index bf6c1f35951b05..c59559cd1958bb 100755
--- a/libraries/AP_Mount/AP_Mount_Topotek.cpp
+++ b/libraries/AP_Mount/AP_Mount_Topotek.cpp
@@ -460,6 +460,7 @@ bool AP_Mount_Topotek::set_tracking(TrackingType tracking_type, const Vector2f&
 // set camera picture-in-picture mode
 bool AP_Mount_Topotek::set_lens(uint8_t lens)
 {
+    GCS_SEND_TEXT(MAV_SEVERITY_INFO, "lens: %d", (int)lens);
     // exit immediately if not initialised
     if (!_initialised) {
         return false;