Sigma Sports 500mm F4 DG OS HSM Instructions page 16

 If the camera power is turned off or lens is detached
while the Optical Stabilizer function is in operation, the
lens may emit a chattering noise, but this is not a
malfunction.
CUSTOM MODE SWITCH
By using USB DOCK (sold separately) and its dedicated
software, SIGMA Optimization Pro, it is possible to
customize the AF speed, OS effect and range of Focus
Limiter of the lens, and the setting can be saved with the
Custom Mode Switch. For further information, please refer
to the SIGMA Optimization Pro "Help" menu.
 For your regular use, please turn off the Custom Mode
Switch. The Focus Limiter Switch does not function when
the custom mode is ON and set as C1 or C2. P.3-(6)
 USB DOCK is dedicated for each mount. Please use a
USB DOCK which corresponds to your lens mount.
USB DOCK for different mounts cannot be used.
 SIGMA Optimization Pro can be downloaded free of
charge from the following website:
http://www.sigma-global.com/download/
TRIPOD SOCKET AND COLLAR
This lens is equipped with a tripod socket. When you
loosen the locking knob on the collar, the lens and camera
can rotate freely to easily position the camera horizontally
16
or vertically. P.3-(7)
CLICK STOP ON/OFF SWITCH
Depending on the shooting conditions, it is possible to turn
the click stop ON or OFF.
P.4-(8) ON - using Click stop
 An optional lens foot, TRIPOD SOCKET TS-81, makes
the lens compatible with the Arca Swiss quick release
plate and clamp.
ABOUT TELE CONVERTERS
This lens can be used as a 1.4x (700mm F5.6 AF) or a 2x
(1000mm F8 MF) hyper-telephoto lens by attaching
SIGMA TELE CONVERTER TC-1401 or SIGMA TELE
CONVERTER TC-2001 respectively.
 Do not use other manufacturers 'teleconverter's, only
those listed above are compatible.
 When SIGMA TELE CONVERTER TC-2001 is attached
to cameras that are compatible with AF at F8, it is
possible to shoot with AF. For details, please refer to
user manual of camera body.
 It is possible to use auto focus in Live View if the
camera is in"contrast detect"AF mode.
LENS HOOD
A detachable hood is provided with the lens. This lens
OFF - not using Click Stop