LUNA OPTICS QUANTUM DIGITAL 2K Instruction Manual page 5

Now rotate the distance focusing wheel (2) until the objects you are viewing are sharp and clear.
After this adjustment is complete, you would generally only need to focus the distance wheel (2)
going forward.
Focusing Tips:
If your eyes feel uncomfortable or the image is not clear enough during observation, it may be
caused by incorrect eyepiece focusing or incorrect distance between left and right eyepieces. You
can focus the two eyepieces again and adjust the distance of two eyepieces again according to the
above methods. You can also close one eye while adjusting the second eye. Ensure that your eyes
can see the clearest image of icons and words on the display screen before using this device to
observe objects at a distance.
MULTI-CONTROLLER (M):
Your binoculars feature a unique and user-friendly adjustment called Multi
Controller (M). It incorporates various operating functions and makes
navigating and adjusting menu functions fast, easy and natural without having
to take your eyes off the eyepieces in the field. It is especially useful when
used in dark conditions where button location may be particularly difficult.
1, During normal observation, rotating controller (M) clockwise will increase image magnification
and rotating it counterclockwise will reduce the image magnification.
2, Short press controller (M) to show quick sub-menu. There, when rotating (M) onto the function,
the sub-menu of that menu will be shown automatically.
3, Press and hold the controller (M) for 2 seconds to enter the main menu. Rotate controller (M) to
scroll to any desired menu function in main menu. Short press controller (M) to enter and then
activate the menu function. Press and hold the controller (M) for 2 seconds to enter the previous
menu or exit the main menu.