Sony SAL50F14 Service Manual ▷ View online
4-13
SAL50F14 (1.4/50) (50mm F1.4)
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 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 = (SR flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Focal-length
f’F (mm)
f (mm)
(Infinity position)
50
44.56 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
SAL50F14 (1.4/50) (50mm F1.4)
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)
• Name Ring Wrench (55mm)
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 focusing ring of the checking lens until red and green color areas are equal on the chart while looking through the micro-
scope.
Note:
If in-focus point cannot be obtained even through the focusing ring is fully turned, perform the following steps (1) to (4) and
shift the position of the focusing ring. (Refer to Fig.4-4-6.)
(1) Set the focusing ring to the infinity stop position, and hold the distance tube block.
(2) Loosen the six screws fixing the focus operating ring.
(3) Turn the helicoid in the direction of the arrow (screw in direction), and tighten the six screws loosened in step (2) temporarily.
(4) Perform the step 4) again.
Fig.4-4-6
Focus Operating Ring
Focusing Ring
Screws
Screws
Screws
4-15
SAL50F14 (1.4/50) (50mm F1.4)
5)
Loosen the six screws fixing the focusing ring set plate, and set the focusing ring to the infinity stop position without moving the
helicoid. (Refer to Fig.4-4-7.)
6)
Tighten the six screws loosened in step 5).
Fig.4-4-7
7)
Check that the focusing ring moves smoothly from minimum distance to infinity, and perform “4-4-1. Flange Back (f’F) Check”
again.
8)
After the adjustment is completed, apply the adhesive bond (B-10) to the position shown in the Fig.4-4-8.
Fig.4-4-8
Focus Operating Ring
Focusing Ring
Screws
Screws
Screws
Focus Operating Ring
Apply the adhesive bond (B-10) (Six screws)
4-16
SAL50F14 (1.4/50) (50mm F1.4)
4-5.
LENS ROM CHECK
Note:
If dialog box of error code appears during the checking, check the reason of error referring to page 4-20.
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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