Canon EOS REBEL T1 i/EOS 500D Instruction Manual page 34

Attaching and Detaching a Lens
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About Zooming
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.
Detaching the Lens
While pressing the lens release
button, turn the lens as shown by
the arrow.
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Turn the lens until it stops, then
detach it.
Attach the rear lens cap to the
detached lens.
To owners of the EF-S18-200mm f/3.5-5.6 IS kit lens:
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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.
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Do not look at the sun directly through any lens. Doing so may cause
loss of vision.
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If the front part (focusing ring) of the lens rotates during autofocusing, do
not touch the rotating part.
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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.
34
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(22.3 x 14.9 mm I 0.88 x0,59 in.)
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35mm image size
(36 x 24 mm /1.42 x 0.94 in.)