Panasonic Lumix S5 Mirrorless Camera - Manual (Page 50)

2. Getting Started
50
0 When you have attached a lens that does not have a communication function
with this camera, after turning on the camera, a message asking for
confirmation of the focal length setting is displayed.
You can register the focal length of the lens when you select [Yes]. (
l 183 )
0 Insert the lens straight in.
Inserting this at an angle to attach it may damage the camera lens mount.
0 After removing the lens, be sure to attach the body cap and the lens rear cap.