Sony SAL100M28 Service Manual ▷ View online
4-11
SAL100M28 (MACRO 2.8/100) (100mm F2.8 Macro)
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.
Appearance
Allowance
Off center
Within 0.05 mm
Astigmatism
Within 0.04 mm
2. Checking Method
1)
Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Fig.4-4-3
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 focus ring of the checking lens from near to infinity side 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.4-4-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-4-4
4)
Calculate the flange back (f'F) of the checking lens using the following formula, and check that the following specification is
satisfied.
If not, perform “4-4-2. Flange Back (f'F) Adjustment”.
Flange back (f'F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Over infinity end: 45.26
± 0.02 mm
5)
After the check is completed, perform “4-5. FOCUS-SHIFT CHECK”.
1000 mm collimator
Checking lens
Ver. 1.3 2008.01
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
4-12
SAL100M28 (MACRO 2.8/100) (100mm F2.8 Macro)
4-4-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
Adjusting Method
1)
Perform “4-4-1. Flange Back (f’F) Check”, and check that the checking lens is out of specification.
2)
Set the focus of checking lens to over infinity end.
3)
Turn the focusing knob of the flange back tester until the chart image is the sharpest, confirm the flange back value. (a: Reading
value)
Flange back (f'F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
4)
According to the result in step 3), calculate amount of increase and decrease of the back adjustment washer using the following
formula. (X: Amount of increase and decrease of the back adjustment washer)
X (Amount of increase and decrease of the back adjustment washer) = a (Flange back value (by over infinity end)) - 45.26 mm
Specification
Over infinity end: 45.26
± 0.02 mm
5)
Adjust the back adjustment washer and coupler adjustment washer thickness according to the result in step 4).
Note:
Use the micrometer gauge (or slide gauge) to measure the back adjustment washer and coupler adjustment washer thickness.
If X (Amount of increase and decrease of the back adjustment washer) is a negative value (-):
Decrease the thickness of back adjustment washer and coupler adjustment washer by the value X.
If X (Amount of increase and decrease of the back adjustment washer) is a positive value (+):
Increase the thickness of back adjustment washer and coupler adjustment washer by the value X.
Table 4-4-1
Ver. 1.3 2008.01
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
Back adjustment washer
Parts No.
T (mm)
A
2-685-590-01
0.05
B
2-685-591-01
0.07
C
2-685-592-01
0.1
D
2-685-593-01
0.2
E
2-685-594-01
0.5
Coupler adjustment washer
Parts No.
T (mm)
A
2-685-525-01
0.05
B
2-685-526-01
0.07
C
2-685-527-01
0.1
D
2-685-528-01
0.2
E
2-685-529-01
0.5
4-13
SAL100M28 (MACRO 2.8/100) (100mm F2.8 Macro)
Fig.4-4-5
6)
Install the back adjustment washer and coupler adjustment washer, and perform “4-4-1. Flange Back (f’F) Check” again.
A
B
C
D
C
B
D
A
Back Adjustment Washer
Coupler Adjustment Washer
4-14
SAL100M28 (MACRO 2.8/100) (100mm F2.8 Macro)
4-5.
FOCUS-SHIFT CHECK
This section describes the check of focus-shift amount resulting change of focal-length by aperture setting.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Aberration Measuring Cap 55mm
1. Preparations
1)
Perform “1. Preparations” of “4-4-1. Flange Back (f’F) Check”.
2. Checking Method
1)
Set the lens aperture to the open aperture position, and measure the flange back (f’F).
2)
Set the aberration measuring cap 55mm (F8 equivalent) on the tip of lens as shown in the Fig.4-5-1, then measure the flange back
(f’F).
Fig.4-5-1
3)
Calculate amount of focus-shift using the following formula, and check that the specification is satisfied.
Note:
The focus-shift amount of the checking lens is difference between the flange back (f’F) of open aperture and flange back
(f’F) reading (using aberration measuring cap 55mm).
Focus-shift = flange back (f’F) reading (using aberration measuring cap 55mm) - flange back (f’F) of open aperture reading
Specification
Focus-shift (mm) =
0
to +0.08
4)
When the focus-shift is out of specification, perform the parts replacement and adjustment/check referring to the Fig.4-5-2.
Fig.4-5-2
Aberration measuring cap 55mm
4-4. FLANGE BACK (f'F)
CHECK/ADJUSTMENT
END
4-4. FLANGE BACK (f'F)
CHECK/ADJUSTMENT
END
4-4. FLANGE BACK (f'F)
4-5. FOCUS-SHIFT CHECK
CHECK/ADJUSTMENT
OK
END
Replace the BLOCK (LEAD FREE),
3 GROUP LENS (A-1192-253-A)
4-5. FOCUS-SHIFT CHECK
OK
NG
Replace the G6 LENS
(2-685-634-01)
4-5. FOCUS-SHIFT CHECK
OK
Replace the BLOCK (LEAD FREE),
FRAME LENS (A-1192-239-A)
NG
Ver. 1.4 2008.05
The changed portions from
Ver. 1.3 are shown in blue.
Ver. 1.3 are shown in blue.
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