Sony SAL2470Z Service Manual ▷ View online
4-20
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
4-3.
OPTICAL AXIS CHECK/ADJUSTMENT
4-3-1. Optical Axis Check/Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
1. Preparations
1)
Set the equipments as shown in the Fig.4-3-1.
Fig.4-3-1
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 (43.50mm) securely to the A-mount attachment and hold them together.
4)
Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig.4-3-2 for correct reading.
Fig.4-3-2
5)
Turn the scale ring of the dial gauge until the long pointer indicates “0”.
Note:
This position is the flange back (f’F) = 43.50 mm.
Memorize the position of short-pointer.
flange back gauge (43.50mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction for correct reading.
4-21
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
2. Optical Axis Check/Adjustment
1)
Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Note:
When attach the checking lens (SAL2470Z) to the flange back tester, remove the rear light shield harrel.
Fig.4-3-3
2)
Set the focus ring of the checking lens to infinity end position while looking through the microscope, and align the optical axis to the
center of the chart image accurately.
3)
Turn the focusing knob of the tester until the chart image is the sharpest (red and green color areas are equal on the chart *).
*: Position in which the color of collimator chart changes from green into red and come into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig.4-3-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-3-4
4)
If the optical axis aligns the most unsharp, rotate the 4th lens assy and adjust the optical axis.
1000 mm collimator
Checking lens
Optical Alignment
Best alignment
Best alignment
Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
4-22
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
4-4.
PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
4-4-1. Projective Resolving Power Check
Equipment
• Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
Note:
Connect the variable transformer (Output voltage: AC 100 V) to the lens test projector.
• A-mount Attachment
• Screen (Art paper)
• Tape Measure
• Plane Mirror (For SLRs)
1. Preparations
Note:
Note:
Check the projective resolving power of the checking lens at the following focal-length and distance.
Focal-length f (mm)
distance (m)
24
1.09
35
1.50
50
2.07
70
2.76
Table 4-3-1
1)
Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal-
length.
(1) Open the lid of the lens test projector.
(2) Pull up and turn the fixed levers on the right and left sides of the lens test projector.
(3) Remove or insert the lens.
Note:
Be sure to have the right position and direction of the lens.
Fig.4-4-1
Lens test projector
Incorporate of the lenses
according to the checking focal-length (f).
according to the checking focal-length (f).
Lens
Fixed lever
Fixed lever
Lid
f=18 to 35 mm
f=35 to 100 mm
f=100 to 200 mm
f=200 to 300 mm
Heat-absorbing filter
Chart
Chart
Chart
Chart
Filament
Filament
Filament
Filament
4-23
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
2)
Attach the checking lens to the lens test projector, and set the equipments as shown in Fig.4-4-2.
Note:
When attach the checking lens (SAL2470Z) to the lens test projector, remove the rear light shield barrel.
3)
Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.
Fig.4-4-2
4)
Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y’=0).
5)
Set the plane mirror to the center of the projected image (y’= 0), and adjust the projector position so that the mirror reflects the light
to the center of the lens.
Distance
Lens test projector
Chart
Fan switch
Lamp switch
Plane mirror
Screen
A-mount attachment
Checking lens
F
L
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