Sony SAL1650 Service Manual ▷ View online
4-3
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
4-2. APERTURE DIAMETER CHECK/ADJUSTMENT
4-2-1. Aperture Diameter Check
Equipment
• Luminance Box
• Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• AE Master Lens
• Memory Card
• Personal Computer (Color Calculator 2 installed)
• Luminance Box
• Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• AE Master Lens
• Memory Card
• Personal Computer (Color Calculator 2 installed)
1. Preparations
Note:
Confirm the checking lens by complete.
1) Install the memory card to the camera.
2) Set the equipment, camera and AE master lens as shown in Fig. 4-2-1.
2) Set the equipment, camera and AE master lens as shown in Fig. 4-2-1.
Luminance box
Luminance: EV12
Luminance: EV12
Camera
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
Master lens or checking lens
Focus: Infinity end
Focus: Infinity end
Shoot the center of the luminance surface
Fig.
4-2-1
3) Shoot the images under the following conditions and save them.
Note:
Shoot the center of the luminance surface three times with the AE master lens and checking lens.
Setting of Luminance box:
Luminance:
EV12
Setting of Lens:
Focus:
Infinity end
Setting of Camera:
ISO:
100
Exposure Mode:
M
Shutter Speed:
1/125
Aperture:
F5.6
Focus Mode:
MF
Metering:
Center weighted
Preset white balance:
Tungsten
D-R:
OFF
2. Checking of Image
Note:
Check the image of both AE master lens and checking lens.
1) Start the Color Calculator 2.
Fig.
4-2-2
2) Read the image from the file menu.
⇒
Fig. 4-2-3
3) Set the Color Calculator 2 as follows.
Measured value display (Display menu): RGB+L*a*b*
Measuring method (Display menu):
Center Single Area
Fig.
4-2-4
Color space (Edit menu): sRGB
Fig.
4-2-5
Area size for calculate (Edit menu
→
Option): 256
×
256 Pixels
Fig.
4-2-6
4-4
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
4) Click the Calculate button to measure the image.
5) After measuring, check the G values.
Average
5) After measuring, check the G values.
Average
G value of the three images shoot with master lens:
(a)
Average
G value of the three images shoot with checking lens: (b)
Calculate button
Check the “G” value
Fig.
4-2-7
3. Checking Method
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
Aperture error = Average G value of checking lens (b) - Average G value of master lens (a)
Specification:
Aperture error = -25 to 0
2) When the aperture error is out of specification, perform 4-2-2. Aperture Diameter Adjustment .
4-2-2. Aperture Diameter Adjustment
Equipment (Only the specific equipment is listed)
• Adhesive bond (B-10)
• Adhesive bond (B-10)
1) Unscrew 2 screws fixing the flexible board (signal board) of main board assy.
2) Peel the G16 mask and remove the rear light interception tube by unscrewing 3 screws.
2) Peel the G16 mask and remove the rear light interception tube by unscrewing 3 screws.
Flexible Board
G16 Mask
Rear Light
Interception Tube
Interception Tube
Fig.
4-2-8
3) Set the preset ring to the extent that the aperture is open by moving the preset lever and fix it.
4) Loosen 2 screws and move them right and left so that the operating lever of the preset ring can move right and left.
4) Loosen 2 screws and move them right and left so that the operating lever of the preset ring can move right and left.
Two screws
Apply the bond
(B-10)
(B-10)
Fig.
4-2-9
5) Move 2 screws right and left, looking into the light source from the mount side.
6) Tighten 2 screws at the position where the blades of aperture are hidden by the neighboring frames.
7) Perform the 4-2-1. Check of Aperture Diameter and repeat steps 1) to 4) until the aperture tolerance meets the specification.
8) After completing the adjustment, apply bond (B-10) to heads of 2 screws tightened in step 5).
6) Tighten 2 screws at the position where the blades of aperture are hidden by the neighboring frames.
7) Perform the 4-2-1. Check of Aperture Diameter and repeat steps 1) to 4) until the aperture tolerance meets the specification.
8) After completing the adjustment, apply bond (B-10) to heads of 2 screws tightened in step 5).
4-3. OPTICAL AXIS CHECK/ADJUSTMENT
Setting of the Flange Back (f F) measuring instrument.
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. Preparations
1) Set the equipment as shown in the Fig. 4-3-1.
Flange back gauge (43.50 mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Fig.
4-3-1
4-5
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
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) Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50 mm) is the sharpest.
3) Attach the flange back gauge (43.50 mm) 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 (43.50 mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig. 4-3-2 for correct reading.
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction 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.
4-3-1. Optical Axis Check
1) Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
1000 mm collimator
Checking lens
Fig.
4-3-3
2) Set the focus ring of the checking lens to
∞
(infinity) index or near
∞
(infinity) and adjust the optical axis, observing the microscope
so that the chart can be seen in the center.
3) Turn the focusing knob of the flange back tester until the chart image comes into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig. 4-3-4.)
Note:
Note:
Figure shows example. The cause depends on individual 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.
Fig.
4-3-4
4) Perform Step (1) through Step (6) and ensure that the AS and CB values are within specifications.
Note:
If the specification is CB only, steps 1 to 3 are not required.
AS
(astigmatism)
The phenomenon where the flare on the ring chart appears in a cruciform shape with the ring chart in the sharpest focus. (Fig. 4-3-5 (a))
(1) Turn the focusing knob until the flare becomes minimum between two approximately opposite points on the ring chart edge (as
shown with the arrows in Fig. 4-3-5 (b)), and then read the dial gauge value. <A>
(2) Turn the focusing knob until the flare becomes minimum between two points with the phase of the flare rotated by 90 degrees
from the above condition (as shown with two arrows in Fig. 4-3-5 (c)), and then read the dial gauge value. <B>
(3) Calculate the AS value (absolute difference between <A> and <B>) and ensure that it is within specifications.
AS value = <A> - <B>
CB (Center Blur)
The phenomenon where the flare on the ring chart trails in one direction with the ring chart in the sharpest focus. (Fig. 4-3-5 (d))
(4) Turn the focusing knob until the ring chart edge in the direction of the maximum flare is in the sharpest focus (as shown with
the arrow in Fig. 4-3-5 (e)), and then read the dial gauge value. <C>
(5) Turn the focusing knob until the ring chart edge, opposite 180 degrees from the above condition (as shown with the arrow in Fig.
4-3-5 (f)) is in focus, and then read the dial gauge value. <D>
(6) Calculate the CB value (absolute difference between <C> and <D>) and ensure that it is within specifications.
CB value = <C> - <D>
(1)
(1)
(2)
(2)
(5)
(4)
AS
E
D
F
H
G
I
CB
Fig.
4-3-5
Specification (TELE end)
CB (center blur)
0.08 mm
Table
4-3-1
5) If the specifications of CB is not satisfied, perform the 4-3-3. Optical Axis Adjustment .
4-6
SAL1650 (DT 16-50 / F2.8) (DT 16-50mm F2.8 SSM)
4-3-2. Optical Axis Adjustment
1) Check the tendency of direction of CB (center blur) at the Tele end (50 mm).
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) Remove the 4th group assy by unscrewing 3 screws.
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) Remove the 4th group assy by unscrewing 3 screws.
4th Group Adjustment Washer
Parts Number
t (mm)
4-411-014-01
0.2 mm
4-411-014-11
0.1 mm
4-411-014-21
0.05 mm
4-411-014-31
0.03 mm
4-411-014-41
0.02 mm
Table
4-3-2
Fig.
4-3-6
5) Increase the thickness of 4th group adjustment washer at the opposite side in the direction that the CB (center blur) tends to move.
6) Tighten screws removed in step 3).
7) Move 2 screws right and left, looking into the light source from the mount side.
8) Tighten 2 screws the position where the blades of aperture are hidden by the neighboring fames.
9) Install the rear light interception tube and perform 4-3-1. Optical Axis Check . Repeat steps 1) to 8) until the optical axis meets the
6) Tighten screws removed in step 3).
7) Move 2 screws right and left, looking into the light source from the mount side.
8) Tighten 2 screws the position where the blades of aperture are hidden by the neighboring fames.
9) Install the rear light interception tube and perform 4-3-1. Optical Axis Check . Repeat steps 1) to 8) until the optical axis meets the
specification.
Flexible Board
G16 Mask
Rear Light
Interception Tube
Interception Tube
4th Group Assy
4th Group
Adjustment Washer
Adjustment Washer
4-4. PROJECTIVE RESOLVING POWER (PARTIAL BLUR ADJUSTMENT) CHECK/AD-
JUSTMENT
4-4-1. Projective Resolving Power Check
Setting of Lens Test Projector.
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
1) Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal
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
Click on the first or last page to see other SAL1650 service manuals if exist.