diff --git a/slides/ws-video/slides.md b/slides/ws-video/slides.md
index 1d45f09e98f57b18934bbc0d2ed010697e7fc93c..ee41542cfa5b154fe919530c857b609195c8935b 100644
--- a/slides/ws-video/slides.md
+++ b/slides/ws-video/slides.md
@@ -183,22 +183,24 @@ https://en.wikipedia.org/wiki/Aperture#/media/File:Lenses_with_different_apertur
 
 |||
 
-- Shallow depth of field <br>
-Long focal length <br>
-Iris wide open -> f1.4
-- Deep depth of field <br>
+- shallow depth of field <br>
+long focal length <br>
+iris wide open -> f1.4
+- deep depth of field <br>
 short focal length <br>
-Iris more closed -> f22
+iris more closed -> f22
 
 |||
 
 ### Focus
 
+- Manual focus
+- focus assist
+
 ---
 
 ## Light
 
-
 |||
 
 ### Color temperature
@@ -217,6 +219,12 @@ https://commons.wikimedia.org/wiki/File:Color_temperature_black_body_800-12200K.
 
 |||
 
+### Color Checker Card
+
+<img data-src="https://git.noc.ruhr-uni-bochum.de/makerspace/homepage/-/raw/main/slides/ws-video/color.jpg" width="100%"/>
+
+|||
+
 ### Lightsource
 
 - Hensel Intra LED