From e52871e21bf73c411eafd86b66d034be47ac299a Mon Sep 17 00:00:00 2001
From: Joel Collins <joel@jtcollins.net>
Date: Mon, 17 Jun 2019 13:54:32 +0100
Subject: [PATCH] Fixed default backlash

---
 openflexure_microscope/plugins/default/autofocus/api.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/openflexure_microscope/plugins/default/autofocus/api.py b/openflexure_microscope/plugins/default/autofocus/api.py
index 9670540f..a737e7fb 100644
--- a/openflexure_microscope/plugins/default/autofocus/api.py
+++ b/openflexure_microscope/plugins/default/autofocus/api.py
@@ -32,9 +32,9 @@ class FastAutofocusAPI(MicroscopeViewPlugin):
         
         # Figure out the parameters to use
         dz = payload.param("dz", default=2000, convert=int)
-        backlash = payload.param("backlash", default=None, convert=int)
+        backlash = payload.param("backlash", default=0, convert=int)
         if backlash < 0:
-            backlash = None
+            backlash = 0
 
         logging.info("Running autofocus...")
         task = self.microscope.task.start(self.plugin.fast_autofocus, dz, backlash=backlash)