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4, Adjustments (Lens Section)
4-1
Bock focus adjustment (T/W zoom correction)
Siemens chart located 3 m away
Monitor
TV
Phillips
screwdriver
Focusing ring, relay lens
* Note:
Open the aperture fully as possible.
(1)
Loosen the screw @).
(2)
With
the telephoto-end
zoom
setting,
bring the pattern image into focus by
turning the focusing ring.
(3)
With
the wide angle end zoom setting,
bring the pattern image into focus by
moving the relay lens back and forth.
(4)
Repeat
the above steps
(2) and {3} to
remove defocusing at the telephoto and
wide angle ends.
(5)
Tighten the screw @).
* Note:
When tightening,
be careful
not to
shift
the relay lens from the correct
position,
(6)
Check
the AF distance measuring
function,
Relay lens
adjusting role
Fig.
11-46
4-2
AF distance measurement
adjusteent
CHART
Siemens chart, 60% or higher
tetlectance chart.
"4, €Q.
[Monitor TV
TOOL
[Hexagonal key wrench (1.27 mii),
section
paper,
index strip
[ abs.
AF distance adjusting screw ((a))
Lspec.
[+0.75 am, -1.0 mn (+: Infinity side}
* Note:
Open the aperture fully es possible.
(1)
Attach the section paper and the index
strip as shown in the Fig. II-47.
(2)
Shoot
the siemens chart
from 3 m away.
(3)
With
the telephote end
setting,
bring the
chart image into best. focus.
Then,
the relevant
index position on the
section
paper.
Replace
the siemens
chart with
the 60% or
higher reflectance chart.
(5)
Mark the center AF stop position between
the infinity and the closest ends on the
section
paper.
(6).
Check
a difference
between
the positions
macked at the steps (3) and (5) is within
the specified range.
(7)
If not, adjust it by turning the hexago-
nal screw
@).
mark
(4)
Section poper
Index strip
9
fe)
Fig. Li-47
4-3
Preparation
for lens focus adjustment
* Note:
For this adjustment, pick up an
actual
scene at infinity (65 m or
more
away),
or use a collimator,
Described
below
is the preparatory
procedures
by using the single-lens reflex camera. and
the
lens
(focal
length:
300
mm or more
recom-
mended)
in stead of a collimator,
Ground glass (30 mm x 40 mm, approx.)
Single-lens reflex camera, lens
(focal length:
magnifier
200 mm or more),
(1)
Open
the aperture
of single-Jens
reflex
camera
fully.
Then,
open
the
rear
rid.
* Note:
If the shutter equips
the valve
mechanism,
lock
it for opening
the
aperture.
If not (e.g. Canon T
series, etc.), open the aperture by
using
the
slow
shutter
and
take
out
the internal battery immediately
while
the shutter
is opened.
Secure the ground glass to the inside
At this step,
the ground surface should face the lens
side.
Sheot
a-scene
at
infinity.
To check
if
it is in best
focus,
enlarge
the image on
the
ground
glass
by a magnifier.
rail face by pressing it.
(3)
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