diff --git a/focus.md b/focus.md
index b4c96f7..b1f9c81 100644
--- a/focus.md
+++ b/focus.md
@@ -22,6 +22,14 @@ f02700018004 000019830000660000804100002f090a1f 020283 848345f2 3e7f53030000 a80
 | 18 | controls if focusing in or out |
 | 21 | focus speed range 81-88 |
 
+## Electronic manual focus
+sample message:
+```
+f01e00012c04 00001983000066000000410000 2f00001d37440040 990255
+```
+| Byte | meaning |
+| ---- | ------- |
+| 18-19 | sets focus point in steps as reported from lens |
 
 ## Info (from Lens to Body)
 Sample message: