Sekonic Studio Deluxe L-28 C2 - C L O S E - U P

5-6. Close-ups
(1)
Whenever
the
subject is
closer
to the
camera than
ten times
the
focal length
of the
camera lens,
the
exposure
indicated
on the
Sekonic
Studio Deluxe
must be increased.
For
example,
a camera
using
a
50
mm
lens must
increase
its
exposure time
for
any object
closer than
50O
mm.
This is
because
a
subject
is increasingly
magnified
as it
approaches
the
lens
of the
camera.
When
light
from
the subject is
focused into
an image
on
the
film
through
the lens,
the following
retation
exists
between
illumination
on
the
f
ilm's
face,
brightness
of the
subject,
and
magnification
of
the
'
subject.
Where:
E
:
illumination
of
film
face
L
:
brightness
of subject
M:
fn?gnification
of
subject
F
:
F
number
r
:
circular
constant
a
:
COnStant
-
a.rL
1
4'F2
(M
+
1)3
From this formula
it
will
be seen that
when
there
is
a
change
in
magnification,
the
brightness
(il-
lumination)
of the film
face
changes
in inverse
proportion
to
(M
*
t;2.
In other words,
when
M is
small, or
when the
distance
from the
camera
to subject
is
great,
the
effect on
the exposure is
minimal.
However,
as the
distance
from
subject
to object
decreases,
M
increases.
(M+1),
is
called
the cor-
rection index for
close-ups.
See
(3)
for
determining
the value
of M.
(2)
Measuring the
Incident
Light
(a)
Hold the
Sekonic meter
as close to
the subject
as
possible
and
point
the Lumisphere
towards
the
camera
lens.
(3)
(b)
lf the
main
or fill-in
lights
are
very
near
the
subject,
the subject
should
be removed
and
the
Lumisphere
held
in
the exact
spot
the
subject
will
occupy.
The
light striking
the
subject
will
then be
the same
as that
striking
the
Lumisphere.
Exposure
corrections
for
close-ups
(a)
First
determine
exposure',as
explained
in 5-6-2.
(b)
Measure
the
size
of the
object, and
of
its image
in the
lens.
Divide
the
larger dimension
into the smaller.
You will
thus
obtain
the magnification
(if
the
image
is
larger
than the
subject)
or reduction
(if
image
is smaller
than
the subject).
Find
the
proper
correction
factor from
the
chart
on the
following
page.
Multiply
this correction
factor by
the exposure
time
indicated
on
Your
meter.
(c)
(d)
(e)
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