Sony SAL30M28 Service Manual ▷ View online
SAL30M28 (DT 2.8/30 MACRO SAM) (DT 30mm F2.8 Macro SAM)
4-4
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 = -15 to +10
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)
1. Set the preset lever to the open of aperture by moving the lever (preset lever) of preset ring and fix it there.
2. Loosen two screws and move them left and right so that the function lever can be moved right and left.
3. Move two screws right and left while observing the light source from the rear lens so that the blades of aperture are completely
2. Loosen two screws and move them left and right so that the function lever can be moved right and left.
3. Move two screws right and left while observing the light source from the rear lens so that the blades of aperture are completely
hidden by the neighboring frame. Then, tighten two screws at this position.
Main Unit Assy
Preset Lever
Screws
Apply the
grease(B-10)
grease(B-10)
Fig.4-2-8
4. Perform 4-2-1. Aperture Diameter Check and repeat steps 1 to 3 until the aperture tolerance satisfies the specification.
5. After finishing the adjustment, apply the adhesive bond (B-10) to the indicated portions of two screws which are tightened in
5. After finishing the adjustment, apply the adhesive bond (B-10) to the indicated portions of two screws which are tightened in
step 3.
4-1-2. Adjustment Flow Chart
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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)
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
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.
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.
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SAL30M28 (DT 2.8/30 MACRO SAM) (DT 30mm F2.8 Macro SAM)
4-5
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))
(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))
(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 ar-
row 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
CB (Deflection from center)
0.08
AS (As on the axis)
0.05
Table
4-3-1
5) If the optical axis does not satisfy the specification, perform 4-3-2. Optical Axis Adjustment .
6) If the optical axis satisfy the specification, perform 4-4-1. Projective Resolving Power Check .
6) If the optical axis satisfy the specification, perform 4-4-1. Projective Resolving Power Check .
4-3-2. Optical Axis Adjustment
1. Replace the front lens (rear) lens assy.
Front Group
(Rear) Group Assy
(Rear) Group Assy
Filter Screw Frame
Outer Barrel
Fig.4-3-6
2. Perform 4-3-1. Optical Axis Check again.
3. If the specification is satisfied, perform 4-4-1. Projective Resolving Power Check .
3. If the specification is satisfied, perform 4-4-1. Projective Resolving Power Check .
4-1-2. Adjustment Flow Chart
SAL30M28 (DT 2.8/30 MACRO SAM) (DT 30mm F2.8 Macro SAM)
4-6
4-4. PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
Perform after completing the focus-shift check/adjustment.
4-4-1. Projective Resolving Power Check
Setting of Lens Test Projector.
Equipment
Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
Note:
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
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
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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
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 loca-
tion 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.
shown in Fig. 4-4-4.
Do not confuse spurious resolution for the smallest pitched lines.
Correct resolution
Spurious resolution
Fig.
4-4-4
SAL30M28 (DT 2.8/30 MACRO SAM) (DT 30mm F2.8 Macro SAM)
4-7
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.
4-1.
Specification
Focal length f (mm)
Distance (m)
Number of the smallest pitched lines (lines/mm)
Center (y' = 0)
Peripheral (y' = 9)
Peripheral (y' = 12)
S
M
S
M
30
1.80
125 lines or
greater
50 lines or
greater
40 lines or
greater
40 lines or
greater
32 lines or
greater
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 (Partial Blur) Adjustment .
4-4-2. Projective Resolving Power (Partial Blur) Adjustment
Adjusting Method
If the projective resolving power of peripheral does not meet the specification, adjust that inserting the adjustment washer in the
position of between G06 frame assy and middle lens barrel assy.
Note:
If the projective resolving power of peripheral does not meet the specification, adjust that inserting the adjustment washer in the
position of between G06 frame assy and middle lens barrel assy.
Note:
Insert the adjustment washer in the position of the front-focus tendency.
Adjustment Washer
t (mm)
3-276-776-41
0.1
3-276-776-81
0.2
Table
4-4-2
G06 Frame Assy
Middle Lens Barrel Assy
Adjustment Washer
Fig.4-4-5
4-1-2. Adjustment Flow Chart
4-5. FLANGE BACK (f F) CHECK/ADJUSTMENT
Equipment
1000 mm collimator
Flange back tester
A-mount attachment
Flange back gauge (43.50 mm)
Flange back tester
A-mount attachment
Flange back gauge (43.50 mm)
4-5-1. Flange Back (f F) Check
1. Preparation
1) Perform 1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
2) Switch the switch knob of the switch panel block of inspecting lens to MF .
1) Perform 1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
2) Switch the switch knob of the switch panel block of inspecting lens to MF .
2. Checking Method
1) Set the focus to the over-infinity end and confirm that the specification is satisfied.
1) Set the focus to the over-infinity end and confirm that the specification is satisfied.
Specification (Over-infinity end)
Focal length f (mm)
Flange back value f F (mm)
30
45.00
±
0.05 (44.95 to 45.05)
Table
4-5-1
2) If the flange back value (f F) of the inspecting lens does not satisfy the value in the Table 4-5-1, perform 4-5-2. Flange Back
(f F) Adjustment .
4-1-2. Adjustment Flow Chart
4-5-2. Flange Back (f F) Adjustment
Preparation
1) Perform 4-5-1. Flange Back (f F) Check and confirm that the flange back (f F) does not satisfy the specification in Table 4-5-
1) Perform 4-5-1. Flange Back (f F) Check and confirm that the flange back (f F) does not satisfy the specification in Table 4-5-
1.
2) Remove the interception.
2. Adjusting Method
1) Set
1) Set
to 45.00 mm by rotating the knob of flange back tester.
2) Set the focus to the infinity end.
3) Loosen three screws fixing the helicoids male.
4) Adjust the focus by moving up the helicoids male (clockwise) of the checking lens or moving it down (counterclockwise).
5) Tighten three screws which are loosened in step 3).
3) Loosen three screws fixing the helicoids male.
4) Adjust the focus by moving up the helicoids male (clockwise) of the checking lens or moving it down (counterclockwise).
5) Tighten three screws which are loosened in step 3).
Focus Ring
Screws
Interception
Switch Panel Block
Move down the Helicoid
Move up the Helicoid
Fig.4-5-1
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