diff --git a/slides/ws-video/slides.md b/slides/ws-video/slides.md
index 33ba3e807ce564f99254585112a38850ad5d0ed7..75b1384a101af2b8d2a149bac0b0e0c310811340 100644
--- a/slides/ws-video/slides.md
+++ b/slides/ws-video/slides.md
@@ -144,11 +144,18 @@ common focal lengths for tight lenses: 85mm, 100mm, 135mm -> more magnified
 
 long focal length compresses the background and helps isolating a subject.
 
+|||
 
+### Aperture / Iris
 
-|||
 
-### Iris / Stop
+
+<img data-src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Lenses_with_different_apertures.jpg/2560px-Lenses_with_different_apertures.jpg" width="50%"/>
+
+CC BY-SA 4.0 
+lenses with different aperture
+By: KoeppiK <br>
+https://en.wikipedia.org/wiki/Aperture#/media/File:Lenses_with_different_apertures.jpg
 
 |||