Sony FE 24-105mm F4 G OSS Service Manual page 45

5-2. OPTICAL AXIS CHECK/
ADJUSTMENT
5-2-1. Setting/Preparation of the Flange Back (f'F)
Measuring Instrument
Equipment and Tools (Common)
• 1000 mm Collimator (See Note)
• Flange Back Tester
• FB Tester Stand
• Camera Table 200200
• A-mount Attachment
• A-E mount conversion attachment
• Flange Back Gauge (43.50 mm)
• Extension Jig (47.00 mm)
Note: Attach the chart to the 1000 mm collimator as shown in the
following fi gure.
Align the marks
Chart
1000 mm collimator
Setting of the Flange Back Tester
1. Set the equipment as shown in the following figure.
A-mount attachment
Objective lens (10x)
Flange back gauge (43.50 mm)
2. Looking through the eyepiece lens, turn the eyepiece ring of the
flange back tester so that cross line or scale in the view is the
sharpest.
3. Attach the flange back gauge (43.50 mm) securely to the A-mount
attachment and hold them together.
4. While applying light to the flange back gauge, turn the focus-
ing knob of the flange back tester so that fine scratches are the
sharpest.
Note 1: Turn the knob in the direction of the arrow of following
fi gure for correct reading.
Focusing knob
5. Turn the scale ring of the dial gauge until the long pointer indi-
cates "0".
Note 2: This position is the fl ange back (f'F) = 43.50 mm.
Memorize the position of the short pointer.
5-5
SEL24105G
Dial Gauge
(Min. scale: 0.01 mm)
Eyepiece lens (7x)
Eyepiece ring
Scale ring
FB Tester Stand
Camera Table
200×200
Always turn the knob
in the arrow direction
for correct reading.
Focus on fine lines
on the surface.