Sony SAL1650 Service Manual ▷ View online
4-7
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
2) Attach the checking lens to the lens test projector, and set the equipment as shown in Fig. 4-4-2.
3) Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.
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. Projective Resolving Power 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
3) Rotate the mount rotational plate of the lens projector while observing y = 9, y = 12, y = 15 or y = 18 and stop it at the location where
the projective resolving power is worst (low).
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.
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 and projected length of the checking lens. (In case of the zoom lens), project the S image and the M image at
each focal point/projected length and confirm that the number of resolution satisfies the specification of the Table 4-4-1.
Specification:
Focal length
f (mm)
Distance
(L)
Number of the smallest pitched lines (lines/mm)
Center (y = 0)
Peripheral (y = 9)
Peripheral (y = 12)
S
M
S
M
16
0.96 m
125 lines or
greater
40 lines or
greater
40 lines or
greater
32 lines or
greater
32 lines or
greater
24
1.44 m
50
3.0 m
Table.
4-4-1
5) Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform 4-4-2.
Projective Resolving Power Adjustment (Partial Defocus Adjustment) .
4-4-2. Projective Resolving Power Adjustment (Partial Defocus Adjustment)
Equipment
• Adhesive bond (B-10)
• Adhesive bond (B-10)
Note:
Check the projective resolving power. If it does not meet the specification, adjust the projective resolving power (partial defocus adjustment).
1. Adjustment method
1) Check the projective resolving power at the Tele end (50 mm) and the partial blur (front focus side, back focus side).
2) Unscrew 2 screws fixing the flexible board (signal board) of main board assy.
3) Peel the G16 mask and remove the rear light interception tube by unscrewing 3 screws.
4) Loosen a bit screws which are indicated in Fig. 4-4-5.
1) Check the projective resolving power at the Tele end (50 mm) and the partial blur (front focus side, back focus side).
2) Unscrew 2 screws fixing the flexible board (signal board) of main board assy.
3) Peel the G16 mask and remove the rear light interception tube by unscrewing 3 screws.
4) Loosen a bit screws which are indicated in Fig. 4-4-5.
Apply the bond
(B-10)
(B-10)
Fig.
4-4-5
5) Shift the 4th group assy from the back focus side to the front focus side and tighten screws loosened in step 3).
6) Install the rear light interception tube and perform 4-4-1. Projective Resolving Power Check . Repeat steps 1) to 5) until the projective
6) Install the rear light interception tube and perform 4-4-1. Projective Resolving Power Check . Repeat steps 1) to 5) until the projective
resolving power meets the specification.
7) After completing the adjustment, apply bond (B-10) as shown in Fig. 4-4-5.
4-8
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
4-5. FOCUS SHIFT/FLANGE BACK (f F) CHECK/ADJUSTMENT
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)
4-5-1. Focus Shift/Flange Back (f F) Check
1. Preparation
1) Perform 1. Preparations of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
1) Perform 1. Preparations of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
2. Focus Shift (Focal Distance) Check.
1) Set the zoom to the TELE end (50 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob.
3) Adjust the focus by rotating the focus ring, starting with the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that it meets the specification at each focal distance.
1) Set the zoom to the TELE end (50 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob.
3) Adjust the focus by rotating the focus ring, starting with the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that it meets the specification at each focal distance.
Note:
Do not rotate the focus ring.
Specification:
Focal length f (mm)
Flange back value f F (mm)
50
44.56
±
0.1 (44.46 - 44.66)
35
24
16
44.56
±
0.06 (44.50 - 44.62)
Table
4-5-1
5) In case that the flange back value (f F) does not meet the value in Table 4-5-1, perform 4-5-2. Focus Shift/Flange Back (f F) Adjust-
ment .
3. Flange Back (f F) Check
1) Set the zoom to the TELE end (50 mm) and the focus to the over-infinity and check that value meets the specification.
2) Adjust the focus by rotating the knob of flange back tester.
3) Check that it meets the value in Table 4-5-2.
1) Set the zoom to the TELE end (50 mm) and the focus to the over-infinity and check that value meets the specification.
2) Adjust the focus by rotating the knob of flange back tester.
3) Check that it meets the value in Table 4-5-2.
Specification (Over-infinity end)
Focal length f (mm)
Flange back value f F (mm)
50
46.27
±
0.15 (46.12 - 46.62)
Table
4-5-2
4) In case that the flange back value (f F) of checking lens does not meet the specification in Table 4-5-2, perform 4-5-2. Focus Shift/
Flange Back (f F) Adjustment .
4-5-2. Focus Shift/Flange Back (f F) Adjustment
1. Preparation
1) Perform 4-5-1. Focus Shift/Flange Back (f F) Check that the flange back at each focal distance does not meet the specification in
1) Perform 4-5-1. Focus Shift/Flange Back (f F) Check that the flange back at each focal distance does not meet the specification in
Table 4-5-1.
2. Adjustment Method
1) Set the zoom to TELE end (50 mm) and the focus to the over-infinity.
2) Adjust the focus by rotating the knob of flange back tester and read the flange back value (Read value: f t).
3) Calculate the increment or decrement of 2nd group adjustment washer by the formula below, using the result read in step 2).
1) Set the zoom to TELE end (50 mm) and the focus to the over-infinity.
2) Adjust the focus by rotating the knob of flange back tester and read the flange back value (Read value: f t).
3) Calculate the increment or decrement of 2nd group adjustment washer by the formula below, using the result read in step 2).
TB=(f t-46.27) / 2.8
TB: Increment/decrement of 2nd group adjustment washer.
ft:
Flange back values at TELE end (50 mm) and over-infinity.
4) According to the result in step 3), increase or decrease the 2nd group adjustment washer.
• In case that TB is positive (+), increase the thickness of 2nd group adjustment washer.
• In case that TB is negative (-), decrease the thickness of 2nd group adjustment washer.
• In case that TB is negative (-), decrease the thickness of 2nd group adjustment washer.
2nd Group
Adjustment Washer
Adjustment Washer
1st Group Assy
1st Group
Adjustment Washer
Adjustment Washer
1st Group Assy
G4 Mask
1st Group retainer
Fig.
4-5-1
2nd Group Adjustment Washer
Part Number
t (mm)
4-299-303-01
0.2
4-299-303-11
0.1
4-299-303-21
0.05
4-299-303-31
0.03
4-299-303-41
0.02
Table
4-5-3
5) Set the zoom to the TELE end (50 mm) and the focus to the NEAR end.
6) Set the flange back tester to 44.56 mm by rotating the knob.
7) Adjust the focus by rotating the focus ring, starting with the NEAR end.
8) Set the zoom to the WIDE end (16 mm).
9) Adjust the focus by rotating the knob of flange back tester and read the flange back value (Read value: f w).
6) Set the flange back tester to 44.56 mm by rotating the knob.
7) Adjust the focus by rotating the focus ring, starting with the NEAR end.
8) Set the zoom to the WIDE end (16 mm).
9) Adjust the focus by rotating the knob of flange back tester and read the flange back value (Read value: f w).
4-9
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
10) Calculate the increment or decrement of FB adjustment washer by the formula below, using the result read in step 9).
WB = f w - 44.56
WB: Increment or decrement of FB adjustment washer
f w: Value of flange back at Wide end (18 mm) and optical infinity
11) According to the value derived in step 10), increase or decrease the FB adjustment washer.
Flexible Board
FB Adjustment
Washer
Washer
Mount Assy
Rear Light
Interception Tube
Interception Tube
Fig.
4-5-2
FB Adjustment Washer
Part Number
t (mm)
4-299-327-01
0.5
4-299-327-11
0.3
4-299-327-21
0.2
4-299-327-31
0.1
4-299-327-41
0.05
4-299-327-51
0.03
4-299-327-61
0.02
Table
4-5-4
• In case that the value of WB is positive (+), increase the thickness of FB adjustment washer.
• In case that the value of WB is negative (-), decrease the thickness of FB adjustment washer.
• In case that the value of WB is negative (-), decrease the thickness of FB adjustment washer.
12) Perform 4-5-1. Focus Shift/Flange Back (f F) Check .
4-6. FOCUSING ERROR AMOUNT CHECK
Shoot images with the lens to be tested and the AE master lens under the following conditions (Note 1), and compare the images to check
the error amount (Note 2).
Note 1:
the error amount (Note 2).
Note 1:
・
Shooting magnification (60, 40, 20 times)
・
Chart for checking the depth area of image-formation (tilting chart 2 types)
・
Defocus value 0
±
10
μ
m
Note 2:
The higher the magnification, the focusing error amount becomes the bigger. Therefore, it is easy to judge of result.
If the error amount is outside of the range, perform 4-9-3. Focusing Error Amount Adjustment (Write
⊿
SB) .
Equipment
• Chart for checking the depth area of image-formation (40, 60 times)
Acquire the Chart_for_checking_image_formation_40x_60x_(E).zip from the each HQ.
• Chart for checking the depth area of image-formation (20 times)
Acquire the Chart_for_checking_image_formation_20x_(E).zip from the each HQ.
• Software
Acquire the following either software from the each HQ.
Software
Camera
DSLR-A700 Defocus checker
DSLR-A700
Defocus Checker 2
SLT-A37/A57/A58/A65/A77/A99
Table 4-6-1
• Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• HASP key
• Personal Computer (supporting Seus-EX)
• AE Master Lens
• HASP key
• Personal Computer (supporting Seus-EX)
• AE Master Lens
J-6082-597-A: 50 mm/F1.7
• Illumination
J-6082-642-A: Fluorescent Lamp (specified color rendering)
J-6082-643-A: Fluorescent Light Stand (high-frequency lighting type)
J-6082-643-A: Fluorescent Light Stand (high-frequency lighting type)
• Memory Card
• Tripod
• Tripod
1. Preparation
1) Insert the memory card to the camera.
2) Set the camera and chart for checking the depth area of image-formation as shown in Table 4-6-2, Fig. 4-6-1 and Fig. 4-6-2.
1) Insert the memory card to the camera.
2) Set the camera and chart for checking the depth area of image-formation as shown in Table 4-6-2, Fig. 4-6-1 and Fig. 4-6-2.
Note 1:
Shooting distance is obtained by shooting magnification and focal length as following.
[Shooting distance] = [shooting magnification]
×
[focal length]
Note 2:
Select the combination according to the Table 4-6-2 Guidelines table.
Note 3:
If the shooting distance using a 60 times chart cannot be ensured indoors, temporarily use a combination of 40 times chart or 20 times chart.
3) Connect the camera and personal computer (when using HASP Key) with USB cable and activate Defocus Checker 2 or DSLR-A700
Defocus checker.
In case Defocus Checker 2 is used, click [Connect] to set connection mode.
Note:
Note:
If an abnormal phenomenon appears during installation of the teleconverter used by the user, install the user s teleconverter.
Guidelines Table
Selection of Shoot-
ing magnification
ing magnification
AF Assist Chart (Size)
Refer to Fig. 4-6-1.
Refer to Fig. 4-6-1.
Applicable Camera
(image sensor type)
(image sensor type)
Applicable Lens
Calculation example
of shooting distance
[shooting magnifica-
tion]
of shooting distance
[shooting magnifica-
tion]
×
[focal length]
= [shooting distance]
60 times
(middle distance)
(middle distance)
AF Assist Chart 60 Times
(200 mm
(200 mm
×
100 mm)
APS-C size type
All
60 times
×
50 mm =
3000 mm
40 times
(middle distance)
(middle distance)
AF Assist Chart 40 Times
(132 mm
(132 mm
×
66 mm)
35 mm full size type
All
40 times
×
50 mm =
2000 mm
20 times
(short distance)
(short distance)
AF Assist Chart 20 Times
(66 mm
(66 mm
×
33 mm)
both size available
• Macro lens
• Lens with a focal length
• Lens with a focal length
of more than 300 mm
20 times
×
300 mm =
6000 mm
Table
4-6-2
4-10
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
(100 mm)
(66 mm)
(33 mm)
(200 mm)
(132 mm)
(66 mm)
AF Assist Chart
60 Times
60 Times
AF Assist Chart
40 Times
40 Times
AF Assist Chart
20 Times
20 Times
Fig.
4-6-1
Camera Setting
Exposure mode
Focus Mode
Focus Area
Focus Mode
Focus Area
Image Size
Super SteadyShot
Drive Mode
Super SteadyShot
Drive Mode
: A (Open Aperture)
: MF
: Spot Focus Area
(Fixed at the center)
: L
: OFF
: Self-timer
: MF
: Spot Focus Area
(Fixed at the center)
: L
: OFF
: Self-timer
Shooting distance
Set the optical axis to the center
of the AF assist chart.
of the AF assist chart.
AF Assist Chart
(60 Times/40 Times)
(60 Times/40 Times)
Chart for checking the depth area of image-formation
(60 Times/40 Times)
(60 Times/40 Times)
Fig.
4-6-2
2. Shooting procedure
1) Click the [Start] of Defocus Checker 2 or DSLR-A700 Defocus checker to start the measurements.
2) Adjust defocus value to obtain 0
1) Click the [Start] of Defocus Checker 2 or DSLR-A700 Defocus checker to start the measurements.
2) Adjust defocus value to obtain 0
μ
m in the manual focus mode.
The tolerance is 0
±
10
μ
m . (Fig. 4-6-3)
3) Click the [Stop] of Defocus Checker 2 or DSLR-A700 Defocus checker.
4) Shoot an image by self-timer.
5) Perform the steps 1) to 4) by using the AE master lens and the lens to be tested.
4) Shoot an image by self-timer.
5) Perform the steps 1) to 4) by using the AE master lens and the lens to be tested.
Note 1:
Shoot images with the AE master lens and the lens to be tested using the same camera.
Note 2:
Perform entire work within 10 minutes because values become unstable as the camera temperature increases.
If the work continues for 10 minutes or longer, cool down the camera and then restart the work.
Note 3:
Since focusing error amount increases in shooting images at a middle or long distance, comprehensive focusing error amount cannot be
determined correctly only by results with short-distance setting. If the shooting distance using a 60 times chart cannot be ensured indoors,
take either of the following methods.
determined correctly only by results with short-distance setting. If the shooting distance using a 60 times chart cannot be ensured indoors,
take either of the following methods.
Method 1
Use 35 mm full size type camera (SLT-A99) and 40 times chart. (When using the 40 times chart, shooting distance can shorten to 2/3 of 60
times chart.)
times chart.)
Method 2
Check the focusing error amount of short distance using 20 times chart temporarily. After that, shoot the something images outdoors in the
middle distance for using 60 times chart, and then check the focusing amount of middle distance.
middle distance for using 60 times chart, and then check the focusing amount of middle distance.
Defocus Checker 2
(For SLT-A37/A57/A58/A65/A77/A99)
(For SLT-A37/A57/A58/A65/A77/A99)
DSLR-A700 Defocus checker
(For DSLR-A700)
(For DSLR-A700)
In case Good (0
± less than 10 μm), frame
of waveform area displays in green.
In case Good (0
± less than 10 μm), frame
of waveform area and defocus value display
in green.
in green.
Fig.
4-6-3
3. The focusing error amount check
1) Open the images shot with the lens to be tested and the AE master lens by the image display software on the PC. (Display the images at
1) Open the images shot with the lens to be tested and the AE master lens by the image display software on the PC. (Display the images at
the same pixel magnification.)
2) Check the displacement between the focus position (peak of image-formation) of the lens to be tested and the focus position of the AE
master lens. (Refer to Fig. 4-6-4 and Fig. 4-6-5.)
3) Compare the error amount in step 2) with the reference value of Table 4-6-3 and check whether the error amount is within the accept-
able range. If the error amount is outside of the range, perform 4-9-3. Focusing Error Amount Adjustment (Write
⊿
SB) .
Reference value
Focal length/
16 – (50 mm)
16 – (50 mm)
Distance
(mm)
1.0 m (20 times)
0
±
18
2.0 m (40 times)
0
±
74
3.0 m (60 times)
0
±
166
Table
4-6-3
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