Canon EOS Rebel SL2 Mode D'emploi page 44

Attaching and Detaching a Lens
Zooming
Detaching the Lens
Do not look at the sun directly through any lens. Doing so may cause loss of
vision.
42
Turn the zoom ring on the lens
with your fingers.
Perform the zoom operation before
focusing. Turning the zoom ring after
achieving focus may throw off the focus.
While pressing the lens release
button, turn the lens as shown by
the arrow.
Turn the lens until it stops, then
detach it.
Attach the rear lens cap to the
detached lens.