Sony SAL28F28 Service Manual ▷ View online
4-13
SAL28F28 (2.8/28) (28mm F2.8)
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 distance tube 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 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.4-4-4.)
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 specification of the Table 4-4-1 is
satisfied.
Flange back (f’F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Focal-length
f’F (mm)
f (mm)
(Infinity position)
28
44.55 to 44.58
Table 4-4-1
5)
When the flange back (f’F) of the checking lens is out of specification of the Table 4-4-1, perform “4-4-2. Flange Back (f’F)
Adjustment”.
1000 mm collimator
Checking 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.
4-14
SAL28F28 (2.8/28) (28mm F2.8)
4-4-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Adhesive bond (B-10)
Adjusting Method
1)
Disassemble or assemble the checking lens into the state of Fig.4-4-5.
Fig.4-4-5
2)
Perform “4-4-1. Flange Back (f’F) Check”, and check that the flange Back (f’F) of the checking lens is out of specification of the
Table 4-4-1.
3)
Turn the focusing knob of the tester until the flange back (f’F) of the checking lens is “44.56 mm”.
Note:
When turning the focusing knob of the tester, chart image check is not required.
4)
Turn the focus ring of the checking lens until red and green color areas are equal on the chart while looking through the microscope.
Note:
If in-focus point cannot be obtained even through the focus ring is fully turned, perform the following steps (1) to (4) and
shift the position of the focus ring. (Refer to Fig.4-4-6.)
(1) Set the focusing ring to the infinity stop position, and hold the focus ring.
(2) Loosen the six screws fixing the focus ring fastening plate.
(3) Turn the helicoid in the direction of the arrow (screw in direction), and tighten the six screws loosened in step (2) tentatively.
(4) Perform the step 4) again.
Fig.4-4-6
G1 Stopper
Mirror Tube Block
Focus Ring Fastening Plate
Focus Ring
Screw
Screw
Screw
Screw
Screw
Screw
4-15
SAL28F28 (2.8/28) (28mm F2.8)
5)
Loosen the three screws fixing the focus ring holding plate, and set the focus ring to the infinity stop position without moving the
helicoid. (Refer to Fig.4-4-7.)
6)
Tighten the six screws applying the adhesive bond (B-10) to the tip of screws.
Fig.4-4-7
7)
Check that the focus ring moves smoothly from minimum distance to infinity, and perform “4-4-1. Flange Back (f’F) Check” again.
Focus Ring Holding Plate
Distance Tube
Apply the adhesive bond(B-10)
Apply the adhesive bond(B-10)
Apply the adhesive bond(B-10)
4-16
SAL28F28 (2.8/28) (28mm F2.8)
4-5.
LENS ROM CHECK
Note:
If dialog box of error code appears during the checking, check the reason of error referring to page 4-17.
Equipment
• Personal Computer (PC)
• Camera DSLR-A100
• USB Cord With Connector
• Lens Adjustment Program
Note:
Lens Adjustment Program is downloadable from the ESI homepage.
1. Preparations
1)
Connect the checking lens to the camera.
2)
Start the lens adjustment program “LensAdjustment.exe” referring to “4-1-2. Lens Adjustment Program”.
Fig. 4-5-1
2. Checking Method
1)
Click the
[Connect]
button on the lens adjustment program.
Note:
Click the
[End]
button to disconnect the USB connection, then lens adjustment program will terminate.
2)
Check that the display of “Lens Code” and “Model Name” is correct.
Note:
Focus position setting is not required.
Fig. 4-5-2
3)
Click the
[End]
button to terminate the lens adjustment program.
4)
Turn the POWER switch of the camera to OFF.
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