Explicitally acquire camera lock

openflexure_microscope/api/v1/blueprints/camera/capture.py

@@ -114,6 +114,8 @@ class ListAPI(MicroscopeView):
             else:
                 abort(400)
 
+        # Explicitally acquire lock (prevents empty files being created if lock is unavailable)
+        with self.microscope.camera.lock:
             output = self.microscope.camera.new_image(
                 write_to_file=True,
                 temporary=temporary,