Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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Detaching the Lens
Be sure the camera is off when removing or 
exchanging lenses. To remove the lens, 
press and hold the lens release button (q) 
while turning the lens clockwise (w). After 
removing the lens, replace the lens caps and 
camera body cap.
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Lenses with Retractable Lens Barrel Buttons
Before using the camera, unlock and extend the lens. Keeping the 
retractable lens barrel button pressed (q), rotate the zoom ring as 
shown (w).
Pictures can not be taken when the lens is 
retracted; if an error message is displayed as 
a result of the camera having been turned 
on with the lens retracted, rotate the zoom 
ring until the message is no longer 
displayed.
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Retracting Lenses with Retractable Lens Barrel Buttons
To retract the lens when the camera is not in 
use, hold the retractable lens barrel button 
(q) and rotate the zoom ring to the “L” (lock) 
position as shown (w). Retract the lens 
before removing it from the camera, and be 
careful not to press the retractable lens 
barrel button when attaching or removing 
the lens.
Retractable lens barrel button