diff --git a/observe_main.html b/observe_main.html
index 645ee2b..51f8cd6 100644
--- a/observe_main.html
+++ b/observe_main.html
@@ -364,7 +364,7 @@
     function make_camera_chooser(setup, key){
         let cameraID = document.createElement("option");
         let text = document.createTextNode(setup.name);
-        cameraID.value = microscope_setups.length;
+        cameraID.value = key;
         microscope_setups[key] = setup