Sony SAL2470Z2 Service Manual ▷ View online
4-7
SAL2470Z2 (Vario-Sonnar 2.8/24-70 ZA SSM II) (Vario-Sonnar T* 24-70mm F2.8 ZA SSM II)
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)
• 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)
• 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
4-4-1
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.
(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.
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
Fig.
4-4-1
2) Attach the checking lens to the lens test projector, and set the equipment as shown in Fig.4-4-2.
Note:
When attach the checking lens 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.
Distance
Lens test projector
Chart
Fan switch
Lamp switch
Plane mirror
Screen
A-mount attachment
Checking lens
F
L
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
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.
2. Checking Method
1) Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y =0).
2) Read the number of the smallest pitched lines at the center (y = 0).
1) Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y =0).
2) Read the number of the smallest pitched lines at the center (y = 0).
The number represents for lines per mm.
Sagittal (S)
Meridional (M)
Fig.
4-4-3
4-8
SAL2470Z2 (Vario-Sonnar 2.8/24-70 ZA SSM II) (Vario-Sonnar T* 24-70mm F2.8 ZA SSM II)
4-8
3) Turn the mount rotation ring of lens test projector until the projected image at a certain peripheral point (y = 15 or 18) on the screen
appears the most unsharp.
Read the number of the smallest pitched lines (both sagittal and meridional: 3 lines) at the peripheral point.
Note:
Note:
When reading the number of the smallest pitched lines, be careful of the spurious resolution.
Spurious resolution is the reversed image of 2 or 4 lines which appears on screen when focus is beyond maximum revolving power as shown
in Fig.4-4-4.
in Fig.4-4-4.
Do not confuse spurious resolution for the smallest pitched lines.
Correct resolution
Spurious resolution
Fig.
4-4-4
4) Change the focal-length (zoom) and distance of the checking lens, and check that the all readings (y = 0, sagittal (S) and meridional
(M) at y = 15 or 18) at each focal-length (zoom) and distance is within the specification of the Table 4-4-2.
Specification
Focal-length
f (mm)
distance (m)
Center (y =0)
(Lines per mm)
y = 15 (Lines per mm)
y = 18 (Lines per mm)
S
M
S
M
24
1.09
125 or greater
50 or greater
40 or greater
40 or greater
25 or greater
35
1.50
125 or greater
50 or greater
32 or greater
40 or greater
25 or greater
50
2.07
125 or greater
50 or greater
32 or greater
40 or greater
20 or greater
70
2.76
125 or greater
50 or greater
40 or greater
40 or greater
25 or greater
Table 4-4-2
4-4-2. Projective Resolving Power Adjustment
Note:
Check the projective resolving power. If it does not meet the specification, adjust the projective resolving power.
1. Projective Resolving Power (Curvature of Field) Adjustment
When the position of maximum resolution locates peripheral, Adjust that position of center locates in front of 16 cm of peripheral.
Check the projective resolving power. Confirm whether the focused point should locate in front or at back of the focused center point,
and adjust.
and adjust.
1) Set the focal length of lens to 70 mm and adjust the focus so that the peripheral y = 18 reaches the maximum resolution.
2) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the
2) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the
projected plane.)
A (mm): front(-), back(+)
3) Set the focal length of lens to 24 mm and adjust the focus so that the peripheral y = 18 reaches the maximum resolution.
4) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the
4) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the
projected plane.)
B (mm): front(-), back(+)
5) According to the result in step 2) and step 4), calculate shift amount of the thickness of G4th-5th adjustment washer using the
following formula.
Shift amount of the thickness of G4th-5th adjustment washer (mm) = ( B - A ) / 1600 + 0.07
In case of negative value (-) of shift amount: decrease the thickness of G4th-5th adjustment washer.
In case of negative value (+) of shift amount: increase the thickness of G4th-5th adjustment washer.
Example: Focal length is 70 mm, if the position of center y = 0 locates in front of 100 mm of the position of maximum resolution of
peripheral y = 18 .
Focal length is 24 mm, if the position of center y = 0 locates in front of 50 mm of the position of maximum resolution of
peripheral y = 18 .
peripheral y = 18 .
A = -100, B = -50
0.10125 (mm) = (-50 - (-100)) / 1600 + 0.07
Increase the G4th-5th adjustment washer of 0.1 mm.
6) Adjust the shift amount according to the result in step 5).
Note:
If increase or decrease the G4th-5th adjustment washer, perform step 7) after doing 4-6-1. Flange Back (f F) Check .
When the checking lens is out of specification, perform 4-6-2. Flange Back (f F) Adjustment and 4-5. FOCUS-SHIFT (FOCAL
LENGTH) CHECK/ADJUSTMENT .
LENGTH) CHECK/ADJUSTMENT .
G4TH-5TH ADJUSTMENT WASHER
Part No.
t (mm)
3-298-864-01
0.05
3-298-864-11
0.07
3-298-864-21
0.1
Table
4-4-3
G4th-5th Adjustment
Washer
Washer
1st Lens Assy
Cam Ring Light
Shield Barrel
Shield Barrel
2nd Lens Assy
2nd Lens (Rear) Assy
2nd Lens (Front) Assy
Fig.
4-4-5
7) Set the focal length of lens to 70 mm and adjust the focus so that the peripheral y = 18 reaches the maximum resolution.
8) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the pro-
8) Confirm that where is the center when the maximum resolution is the peripheral. (Check whether it locates in front or back of the pro-
jected plane.)
C (mm): front(-), back(+)
9) According to the result in step 8), calculate shift amount of the thickness of 3rd-4th adjustment washer using the following formula.
Shift amount of the thickness of 3rd-4th adjustment washer (mm) = C / 1600 + 0.1
In case of negative value (-) of shift amount: decrease the thickness of 3rd-4th adjustment washer.
In case of positive value (+) of shift amount: increase the thickness of 3rd-4th adjustment washer.
4-9
SAL2470Z2 (Vario-Sonnar 2.8/24-70 ZA SSM II) (Vario-Sonnar T* 24-70mm F2.8 ZA SSM II)
Example: If the position of center y = 0 locates in front of 50 mm of the position of maximum resolution of peripheral y = 18 .
0.06875 (mm) = -50 / 1600 + 0.1
Increase the 3rd-4th adjustment washer of 0.07 mm.
3RD-4TH ADJUSTMENT WASHER
Part No.
t (mm)
2-899-276-01
0.05
2-899-276-11
0.07
2-899-276-21
0.1
2-899-276-31
0.2
Table
4-4-4
Rear Light Shield Barrel
3rd-4th Adjustment Washer
4th Lens Assy
4th Hold Washer
Fig.
4-4-6
10) Mark the mount index side of the 4th lens holder using a permanent marker, remove the 4th lens assy.
11) Increase or decrease the 3rd-4th adjustment washer according to the result in step 9), align the marking part of 4th lens assy to mount
11) Increase or decrease the 3rd-4th adjustment washer according to the result in step 9), align the marking part of 4th lens assy to mount
index side and install it.
12) If the projective resolving power does not meet the specification, adjust again.
Note:
If increase or decrease the 3rd-4th adjustment washer, perform 4-6-1. Flange Back (f F) Check .
When the checking lens is out of specification, perform 4-6-2. Flange Back (f F) Adjustment and 4-5. FOCUS-SHIFT (FOCAL
LENGTH) CHECK/ADJUSTMENT .
LENGTH) CHECK/ADJUSTMENT .
2. Projective Resolving Power (Partial Blur) Adjustment
Check the projective resolving power. Conform the following adjustment if necessary.
1) Set the focal length of lens to 70 mm and adjust the focus so that the center y = 0 reaches the maximum resolution.
2) Check projective resolving power at reach peripheral point of y = 18 .
2) Check projective resolving power at reach peripheral point of y = 18 .
(1) If the projective resolving power does not meet the specification, rotate the 4th lens assy, adjust the defective parts to out of picture
frame.
(2) If the adjustment is impossible according to the procedure (1), replace the 2nd lens assy.
4-5. FOCUS-SHIFT (FOCAL LENGTH) CHECK/ADJUSTMENT
In this section, the check and adjustment of change amount of focused point caused by the change of focal length are described.
Equipment
• 1000 mm Collimator
• Flange back Tester
• A-mount Attachment
• Flange back Gauge (43.50 mm)
• Adhesive bond (B-10)
• 1000 mm Collimator
• Flange back Tester
• A-mount Attachment
• Flange back Gauge (43.50 mm)
• Adhesive bond (B-10)
1. Preparation
1) Remove the zoom rubber ring.
2) Execute 4-3-1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
1) Remove the zoom rubber ring.
2) Execute 4-3-1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
Zoom Rubber Ring
Fig.
4-5-1
2. Checking Method
1) Set the zoom to TELE end.
2) Rotate the knob of flange back tester and set the 44.56 mm of dial gauge.
3) Rotate the focus ring from near side, achieve good focus.
4) Confirm whether the flange back value (f F) meet specification in each focal length even if focal length is changed.
1) Set the zoom to TELE end.
2) Rotate the knob of flange back tester and set the 44.56 mm of dial gauge.
3) Rotate the focus ring from near side, achieve good focus.
4) Confirm whether the flange back value (f F) meet specification in each focal length even if focal length is changed.
Note:
Holding the focus ring by hand not to move.
Flange back (f F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
f (mm)
f F (mm)
24 to 50
44.46 to 44.66
51 to 70
44.46 to 44.71
Table
4-5-1
5) When the flange back (f F) of the checking lens is out of specification of the Table 4-5-1, perform 3. Adjustment Procedure .
4-10
SAL2470Z2 (Vario-Sonnar 2.8/24-70 ZA SSM II) (Vario-Sonnar T* 24-70mm F2.8 ZA SSM II)
3. Adjustment Procedure
1) Attach the checking lens to the flange back tester.
2) Set the zoom to WIDE end and focus to infinity.
3) Rotate the knob of flange back tester to achieve good focus.
4) Set the zoom to TELE end and rotate the focus ring from near side, achieve good focus.
5) Repeat steps 2) to 4), adjust TELE end and WIDE end becomes same focus.
6) Read the flange back value when TELE end and WIDE end becomes same focus.
7) Add 0.8 to the flange back value, rotate the knob of flange back tester to achieve good focus as become the value.
1) Attach the checking lens to the flange back tester.
2) Set the zoom to WIDE end and focus to infinity.
3) Rotate the knob of flange back tester to achieve good focus.
4) Set the zoom to TELE end and rotate the focus ring from near side, achieve good focus.
5) Repeat steps 2) to 4), adjust TELE end and WIDE end becomes same focus.
6) Read the flange back value when TELE end and WIDE end becomes same focus.
7) Add 0.8 to the flange back value, rotate the knob of flange back tester to achieve good focus as become the value.
Example: In the case of flange back value = 44.67 44.67 + 0.8 = 45.47 (mm)
8) Set the zoom to TELE end and focus to over infinity end.
9) Loosen the two screws fixing the focus connect plate from the hole of zoom barrel.
10) Holding the focus ring by hand not to move, set the focus connect plate in the arrow direction and achieve good focus.
11) Tighten the two screws, apply the adhesive bond (B-10) to the tip of two screws.
9) Loosen the two screws fixing the focus connect plate from the hole of zoom barrel.
10) Holding the focus ring by hand not to move, set the focus connect plate in the arrow direction and achieve good focus.
11) Tighten the two screws, apply the adhesive bond (B-10) to the tip of two screws.
Apply the adhesive bond (B-10)
Adjustment direction
Focus Ring
Focus Connect Plate
Fig.
4-5-2
4-6. FLANGE BACK (f F) CHECK/ADJUSTMENT
4-6-1. Flange Back (f F) Check
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
1. Preparation
1) Execute 4-3-1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
1) Execute 4-3-1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
2. Checking Method
1) Calculate the flange back (f F) of the checking lens using the following formula, and check that the specification of the Table 4-6-1 is
1) Calculate the flange back (f F) of the checking lens using the following formula, and check that the specification of the Table 4-6-1 is
satisfied.
Flange back (f F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
• When focus is infinity end (over infinity).
• When focus is infinity end (over infinity).
f (mm)
f F (mm)
24
44.70 to 44.79
70
45.21 to 45.51
Table 4-6-1
2) When the flange back (f F) of the checking lens is out of specification of the Table 4-6-1, perform 4-6-2. Flange Back (f F)
Adjustment .
4-6-2. Flange Back (f F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
Note:
Perform the flange back value (f F) adjustment after completing 4-5. FOCUS-SHIFT (FOCAL LENGTH) CHECK/ADJUSTMENT .
1. Adjustment Procedure
1) Perform 4-6-1. Flange back (f F) Check and confirm that the flange back value (f F) of lens to be checked does not meet the
1) Perform 4-6-1. Flange back (f F) Check and confirm that the flange back value (f F) of lens to be checked does not meet the
specification in Table 4-6-1.
2) Set the zoom to WIDE end and focus to over infinity end.
3) Turn the knob of flange back tester to achieve good focus, read the flange back value (f F).
4) Using the formula below from result in step 3), calculate the shift amount (X).
3) Turn the knob of flange back tester to achieve good focus, read the flange back value (f F).
4) Using the formula below from result in step 3), calculate the shift amount (X).
Shift amount (X) = f F (measured value) with focal length 24 mm at the over infinity end - 44.705 mm
X = Shift amount to be adjusted by the back adjustment washer
5) According to the result in step 4), adjust the thickness of back adjustment washer. (Refer to Table 4-6-2.)
Note:
Measure the thickness of back adjustment washer with a micrometer (or a caliper).
• In case of negative value (-) of shift amount (X), make the back adjustment washer thinner by X.
• In case of positive value (+) of shift amount (X), make the back adjustment washer thicker by X.
• In case of positive value (+) of shift amount (X), make the back adjustment washer thicker by X.
Back Adjustment Washer
Part No.
t (mm)
2-899-280-01
0.05
2-899-280-11
0.07
2-899-280-21
0.10
2-899-280-31
0.20
2-899-280-41
0.50
Table
4-6-2
6) Insert the back adjustment washer, and perform 4-6-1. Flange back (f F) Check .
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