Canon t70 - Manual (Page 63)

(5) Depth of Fiotd
When yxDur $uOject IS in focus. thc<e is » cerUn
area (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 13 g'eaier the shorte' the
fecal length of the ens. For examp'e. a 24 mm
tens p<ovide greater dcglh of field than a SO
mm 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
m ihe bacirgro j^d tnan in tno Icregrojnd
by aroUooItv^o to one
. 7 10 15 30 It
5 2 , 3 -|5 10 00 m
I 111 l-r-l. 1 « 1 I
n It til 4 I 4 Itnt a
:U^UI II U 22
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
5
m. Any subject from 2.4 m to 4 5 m av^ay will
be *r reasonably sharp focus.
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