Nikon-Ti/Optical-configs/customising-optical-configurations.md

+##What is an Optical Configuration?
+An Optical Configuration (OC) is a shortcut to the setup the microscope for an image.  It keeps track of the
+
+* Lenses
+* Filters
+* Light source settings
+* Camera settings
+
+The choice of light source, filters and lens are what distinguish OC's. These don't change between samples.  
+
+The light source intensity and camera exposure and gain will need to tweaked depending on your sample.
+
 ## Default Optical configurations
 
 There is default set of Optical Configurations (OCs) to get you started.  You can't change the settings on these shared OCs.  You can use this default OCs as templates to create your own OCs where you set save the settings for the camera, light source, etc.   
@@ -10,14 +22,15 @@ There is default set of Optical Configurations (OCs) to get you started.  You ca
 
 2. A window will appear to rename the OC.  Add something to help you remember the experiment. 
 
-3. Change the settings so the image of sample is well exposed:
 
-	a. Camera exposure and gain.
-	
-	b. Light source intensity.
+## Saving the settings in an OC 
+Change the settings like light source intensity camera exposure an gain so the image of sample is well exposed.
+
+1. Save the settings into the new OC by clicking on the arrow next to the OC.
 
-4. Save the settings into the new OC by clicking on the arrow next to the OC.
+2. The OC should have a red `!` mark to alert to the settings have been changed and not saved
 
+3. Click on the small triangle on the left of the OC button save the settings