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Chapter 1: Exploring Your Canon EOS Rebel SL1/100D
4. Twist the lens clockwise until it locks into place.
Don’t force the lens.
If the lens doesn’t lock into place with a gentle twist,
you may not have aligned it properly.
What’s my focal length multiplier?
The sensor on your SL1/100D is smaller than the
frame size of 35mm film. Therefore, the resulting
image is a smaller area than what you’d
capture using a 35mm film camera or a dSLR
with a sensor that’s the same size as a frame
of 35mm film (a
full-frame
sensor). When you
use a camera with a sensor smaller than the
frame size of 35mm film, you can zoom in closer
with a telephoto than would be possible with a
camera with a full-frame sensor. Photographers
who are experienced shooting with 35mm
cameras like to know how lenses will behave
on a camera without a full-frame sensor. They
find out by multiplying their camera’s focal
length multiplier by the focal length of the lens.
The focal length multiplier for the SL1/100D is
1.6. Therefore, a dSLR 50mm lens captures the
same field of view as an 80mm (50mm
×
1.6) lens
does on a 35mm film camera or full-frame digital
SLR. When I suggest a focal length, I refer to
it as the 35mm equivalent. For example, if I
specify a telephoto focal length that’s the 35mm
equivalent of 80mm, this is a 50mm lens on the
SL1/100D.
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