Canon EOS 30D Instruction Manual page 277

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The magnification ratio indicates the ratio of image size captured
on sensor or film to the actual size of the subject. When using
a magnification ratio of 1x, for example, the image captured on the
sensor or film is the same size as the subject. The maximum
magnification ratio represents the largest image size of a subject
captured by 1he lens. The maximum magnification ratio for standard lens
EF-S18-55mm F3.5-5.611 USM is O.28x (at 55mm) while the maximum
magnification ratio for the EF-S60mm f/2.8 Macro USM lens is 1x.
1x
In other words, 100mm or 180mm macro lenses have
narrower angles of view than that of a 60mm lens. So
if you're shooting the same subject from the same
distance, the subject appears larger with a lOOmm
or 180mm macro lens.
O.28x O.5x
of
Making the subject the center of attention requires that
the photographer take great care in determining the
focus. Since "camera shake" happens easily, use of a
tripod may be necessary in many cases.
I 33 I
50mm
lOOmm 180mm