U^ui ii u – Canon t70 User Manual

Page 63

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(5) Depth of Fiotd

When yxDur $uOject IS in focus. thcarea (H front of it and behrd it which y/lli also be
in ÍCCUS. This range of sharoness Is calleo depth

of Depth of field

g'eaier the shorte' the

fecal length of the

ens.

For examp'e. a 24 mm

tens pmm lens.prov'idcO the aperture and shooing dis*

tarce are the same. Depth field ts else greater
ihe longer the shootng distance anrf is generally
greater

ihe bacirgro j^d tnan in tno

Icregrojnd

by aroUooItv^o to one

30 It

2 , 3 -|5 10

I 111 l-r-l. 1 « 1 I

n It til 4 I 4 Itnt a

:U^UI II U

To check the depth of field:

1) First Focus. Then press the shutle* bjtton half

way and read ihe aperture r^umaer v/hich ao*
pears in Ihe ve'/Zindor. Find the

"wo apenure

numbO'S on the deptr>-oMiofd scale on the

*ens v/hich correspond to that number.

2) Draw Imaginary lines from those tvic num

bers to the distance scale. The effectr/e
depth of field lies beiv^een ihoso Iv^o dis

tances. For example, using a standard 50

mm lens focused at 3 m v#^th the aperture set
at ife. depth of f»ed extends from 2 4 m to 4

m. Any subject from 2.4 m to 4 5 m av^ay will

be *r reasonably sharp focus.