Leica DM500 Manual page 21

Leica EZ Viewing Tube – integrated eyepieces (cont.)
You can now safely rotate the Leica EZ
viewing tube by loosening the captive
thumbscrew, rotating the viewing tube, and
tightening the captive thumbscrew again.
The eyepieces are already integrated
with the Leica EZ viewing tube and are
pre-adjusted for corrected vision; therefore no
eyepiece adjustment or insertion is necessary.
Go on to the section "Eyeguards" on page 23.
Leica DM 500, DM500 B Manual 21