Zoom  - Canon EOS 7D Instruction Manual

Attaching and Detaching a Lens
About Zooming
Detaching the Lens
To owners of the EF-S 18-200mm f/3.5-5.6 IS lens:
Do not look at the sun directly through any lens. Doing so may cause

loss of vision.
If the front part (focusing ring) of the lens rotates during autofocusing, do

not touch the rotating part.
Image Conversion Factor
Since the image sensor size is
smaller than the 35mm film
format, it will look like the lens
focal length is increased by 1.6x.
32
To zoom, turn the zoom ring on the lens
with your fingers.
If you want to zoom, do it before
focusing. Turning the zoom ring after
achieving focus may throw off the
focus slightly.
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.

You can prevent the lens from extending
out while you are carrying it around. Set
the zoom ring to the 18mm wide-angle
end, then slide the zoom ring lock lever
to <LOCK>. The zoom ring can be
locked only at the wide-angle end.
Image sensor size
(22.3 x 14.9 mm / 0.88 x 0.59 in.)
35mm image size
(36 x 24 mm / 1.42 x 0.94 in.)