diff --git a/slides/ws-video/slides.md b/slides/ws-video/slides.md
index c7dffa3082dda472366fce47a06a21f13c003103..8b2e91e8b9ddb70c22c43a44f869c1b412f6c885 100644
--- a/slides/ws-video/slides.md
+++ b/slides/ws-video/slides.md
@@ -120,6 +120,14 @@ Best possible dynamic range while shooting with these ISO values.
 
 |||
 
+- focal length
+- aperture
+- focus
+
+<img data-src="https://upload.wikimedia.org/wikipedia/commons/9/9f/Angenieux_Optimo_Ultra_12X.jpg" width="50%"/>
+
+|||
+
 ## Lenses
 
 - Prime lense with a fixed focal length. <br> faster apterture