Canon EOS REBEL T3 Basic Instruction Manual page 416

Useful info:
Basics of macro photography
Magnification ratio
This ratio expresses the relative size of the image,
compared to the subject.
The larger the magnification ratio,
the larger the subject appears.
The mognification ralio indicates the ratio of imoge size captured
on sensor or
~Im
10
the octuol size althe subject. When using
a magnification rona all x,
far
example, the image captured on the
sensor or film is the same size as the subject. The maximum
magnification rolio represents the largest image size of a subject
capI.Kec by the lens.
n..
maximum
mognilicotioo
roIia
Ie< slanclc<c lens
Ef-S I8-55mm f/3 5-5.615 II is 0.34x lot 55mmJ while
the
maximum
magni"callon rolla for
the
Ef-S60mm f/2.8 Macro USM lens is Ix. "
, a.
The shorter the camera to subject distonce,
the greater the blurring in front
and back of the focused oreo
i\f\oking the subject the center of attention requires that
the photographer take great core in determining the
focus. Since "'camero shake" happens easily, use of
0
tripod
may
be
necessary in many cases
The longer the facallenglf the greater tile Ie,escapic effect.
the narrower the angle of ,iew
In other
words,
lOOmm or 180mm mocro lenses hove
narrower angles of View than that of a 60mm lens.
So
if
you're shooling the same subject from the same
distance, the subject appears larger with a 100mm
or 180mm macro lens.
A number related to the angle of view of a lens.
so"'''''
100",,,,
180",,,,,
I 33 I