Sony SAL20TC Service Manual ▷ View online
4-2
SAL20TC (2x TELE CONVERTER) (2 X Teleconverter)
4-2.
PRESET LEVER POSITION CHECK AND ADJUSTMENT
This converter has the function transmitting the control of aperture to the attached lens.
Please check and adjust the preset lever when disassembling or assembling the parts related
to the position of preset (such as connect ring, preset ring, preset lever and fixed barrel).
Equipments:
• Preset Lever adjustment jig (J-6082-639-A)
• Maximum Aperture jig (J-6082-640-A)
1. Check and adjustment
1)
Attach the jigs on the converter and set the preset lever to the open aperture position.
2)
The clearance gap of arrowed part should be 0.1mm to 0.2mm.
3)
If the clearance gap does not meet the above-mentioned value, loosen two screws
(2-687-687-01) for the preset lever B, and move the preset lever B to adjust the distance.
4)
After adjusting, apply the adhesive (B-10) to the screw head to fix.
Fig.4-2
Screw (2-687-687-01)
Preset lever B
Jig for adjustment
preset lever
preset lever
0.1mm to 0.2mm
Jig for maximum aperture
0.1mm to 0.2mm
4-3
SAL20TC (2x TELE CONVERTER) (2 X Teleconverter)
4-3.
FLANGE BACK (f’F) CHECK/ADJUSTMENT
4-3-1. Flange Back (f’F) Check
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• SAL135F28 (product)
Note:
“Checking lens” in the sentence means SAL20TC.
1. Preparations
1)
Set the equipments as shown in the Fig.4-3-1.
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 (43.50mm) 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 (43.50mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig.4-3-2 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) = 43.5 mm.
Memorize the position of short-pointer.
flange back gauge (43.50mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction for correct reading.
4-4
SAL20TC (2x TELE CONVERTER) (2 X Teleconverter)
2. Checking Method
1)
Attach the checking lens and SAL135F28 (product) to the flange back tester, and set the 1000 mm collimator.
Fig.4-3-3
2)
Set the focus ring of the
SAL135F28 (product)
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 focusing knob of the tester 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.4-3-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-3-4
4)
Calculate the flange back (f’F) of the checking lens using the following formula, and check that the specification of the Table 4-3-1 is
satisfied.
Flange back (f’F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
f’F (mm) (Focus of the SAL135F28 is infinity end)
“Flange back (f’F) of the SAL135F28” to +0.12 mm
Table 4-3-1
5)
When the flange back (f’F) of the checking lens is out of specification of the Table 4-3-1, perform “4-3-2. Flange Back (f’F)
Adjustment”.
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.
1000 mm collimator
SAL135F28 (product)
Checking lens
Ver. 1.2 2008.01
The changed portions from
Ver. 1.1 are shown in blue.
Ver. 1.1 are shown in blue.
4-5
SAL20TC (2x TELE CONVERTER) (2 X Teleconverter)
4-3-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• SAL135F28 (product)
Adjusting Method
1)
Perform “4-3-1. Flange Back (f’F) Check”, and check that the flange back (f’F) of the checking lens is out of specification of the
Table 4-3-1.
“4-3-1. Flange Back (f’F) Check” is done with the SAL135F28 (product) detached, and flange back value only of the SAL135F28
(product) is measured.
2)
Calculate focus error amount using the following formula.
Focus error amount = { Flange back value (f'F) - SAL135F28 (product) Flange back value (f'M) + 0.06 mm } / 3
Focus error amount: Amount that should be adjusted by the back adjustment washer thickness.
f’F:
Flange back value (Reading value) of the checking lens.
f’M:
Flange back value (Reading value) only of SAL135F28 (product).
3)
Adjust the back adjustment washer thickness according to the result of step 2). (Refer to Table 4-3-2 and Fig.4-3-5.)
Note:
Use the micrometer gauge (or slide gauge) to measure the back adjustment washer thickness.
If focus error is a negative value: Decrease back adjustment washer thickness by error amount to increase flange back.
If focus error is a positive value:
Increase back adjustment washer thickness by error amount to decrease flange back.
Back adjustment washer
Parts No.
T (mm)
A
2-687-648-01
0.05
B
2-687-649-01
0.07
C
2-687-650-01
0.1
D
2-687-651-01
0.2
E
2-687-652-01
0.5
Table 4-3-2
Fig.4-3-5
4)
Install the back adjustment washer, and perform “4-3-1. Flange Back (f’F) Check” again.
Back adjustment washer
Ver. 1.3 2008.12
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
Click on the first or last page to see other SAL20TC service manuals if exist.