Sony SAL1635Z Service Manual ▷ View online
4-10
SAL1635Z (Vario-Sonnar 2.8/16-35 ZA T
*
SSM) (Vario-Sonnar T
*
16-35mm F2.8 ZA SSM)
4-5.
FOCUS-SHIFT/ FLANGE BACK (f’F) CHECK/ ADJUSTMENT
In this section, the check/adjustment of focus-shift, which arises from the change of the focal length by zooming, is described.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Adhesive bond (B-50)
4-5-1. Focus-shift/ Flange Back (f’F) Check
1. Preparations
1)
Perform “LENS GENERAL ADJUSTMENT GUIDE 3. FLANGE BACK (f’F)/OPTICAL AXIS CHECK”.
2. Focus-shift Check
1)
Set the zoom to the TELE end.
2)
Set to “44.56mm” by rotating the knob of flange back tester.
3)
Focus by rotating the focus ring from the near end side.
4)
Change the focal length and check that the flange back value at each focal length satisfies the specification below.
Note:
Do not rotate the focus ring.
Specification
Focal Length f (mm)
Flange Back Value f’F (mm)
16 - 35
44.48 - 44.64
Table 4-5-1
5)
If the flange back value (f’F) of the checking lens does not satisfy the specification in Table 4-5-1, perform “4-5-2. Focus-shift/
Flange Back (f’F) Adjustment”.
3. Flange Back (f’F) Check
1)
Set the zoom to the WIDE end (16mm) and the focus to the over infinity end and then check that the flange back satisfies the
specification.
2)
Set the zoom to the TELE end (35mm) and the focus to the over infinity end and then check that the flange back satisfies the
specification.
Specification: Over infinity end
Focal Length f (mm)
Flange Back Value f’F (mm)
16 (WIDE end)
44.68 -44.73
35 (TELE end)
44.85 - 45.11
Table 4-5-2
3)
If the flange back value (f’F) of the checking lens does not satisfy the specification in Table 4-5-2, perform “4-5-2. Focus-shift/
Flange Back (f’F)” adjustment.
4-11
SAL1635Z (Vario-Sonnar 2.8/16-35 ZA T
*
SSM) (Vario-Sonnar T
*
16-35mm F2.8 ZA SSM)
4-5-2. Focus-shift/Flange Back (f’F) Adjustment
1. Focus-shift Adjustment
1)
Remove the focus rubber ring.
2)
Set the zoom to the TELE end.
3)
Rotate the focus ring to over infinity side and by turning further from the infinity end set it at the position where the decentering
roller (decentering, no decentering) can be seen through the hole for decentering roller.
4)
Loosen three screws fixing the decentering roller (decentering, no decentering).
5)
Set the zoom to the WIDE end and the focus to the over infinity end.
6)
Focus by rotating the knob of flange back tester. At this moment, read the flange back value.
7)
Add “0.275” to the read flange back value. Then, rotate the knob of flange back tester so that this added value can be achieved.
Example) In case that the read value is 44.67: 44.67 + 0.275 = 44.945 (mm)
8)
Set the zoom to the TELE end and focus by changing the position of the 2nd lens block.
• Change the position of 2nd lens block. (Shift the decentering roller or decentering roller (no decentering) along the lead groove.)
Note:
Do not rotate the decentering roller.
9)
Adjust by repeating steps 5) to 8) so that the focus at the WIDE end becomes equal to that at the TELE end.
Then, tighten the screws loosened in step 4).
10) After finishing the focus-shift and the optics axis adjustment, apply the bond (B-50) to the decentering roller (decentering, no
centering) and the 2nd lens holder.
Fig. 4-5-1
Focus Rubber Ring
The Hole for Decentering Roller
4-12
SAL1635Z (Vario-Sonnar 2.8/16-35 ZA T
*
SSM) (Vario-Sonnar T
*
16-35mm F2.8 ZA SSM)
2. Flange Back (f’F) Adjustment
1)
Set the zoom to the WIDE end and the focus to the over infinity end.
2)
Focus by rotating the knob of flange back tester. At this moment, read the flange back value.
3)
Calculate the amount of increase or decrease of back adjustment washer by the formula below, using the result derived from step 2).
Amount of increase or decrease of back adjustment washer (mm) =
Flange back f’F (measured value) of focal length (16mm) at over infinity end - 44.705mm
• In case that the amount of back adjustment washer is negative (-): Decrease
thickness of
the back adjustment washer.
• In case that the amount of back adjustment washer is positive (+): Increase
thickness of
the back adjustment washer.
Back Adjustment Washer
Part No.
Description
2-899-280-01
BACK ADJUSTMENT WASHER (t=0.05)
2-899-280-11
BACK ADJUSTMENT WASHER (t=0.07)
2-899-280-21
BACK ADJUSTMENT WASHER (t=0.1)
2-899-280-31
BACK ADJUSTMENT WASHER (t=0.2)
2-899-280-41
BACK ADJUSTMENT WASHER (t=0.5)
Table 4-5-3
Fig. 4-5-2
4)
Adjust by repeating steps 1) to 3) until the flange back satisfies the specification.
Connection Board
Rear Light Shield Barrel
Mount Block Assy
Rear Outer Block Assy
Back Adjustment Washer
Ver. 1.1 2009.02
The changed portions from
Ver. 1.0 are shown in blue.
Ver. 1.0 are shown in blue.
4-13
SAL1635Z (Vario-Sonnar 2.8/16-35 ZA T
*
SSM) (Vario-Sonnar T
*
16-35mm F2.8 ZA SSM)
4-6.
FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF SPHERICAL
ABERRATION))
ABERRATION))
In this section, the check/adjustment of focus-shift, which arises from the change of aperture, is described.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Tester (43.50mm)
• Aberration Measuring Cap 77mm (1635) (Equivalent to F8)
4-6-1. Focus-shift (Aperture (Amount of spherical aberration)) Check
1. Preparations
1)
Perform “LENS GENERAL ADJUSTMENT GUIDE 5. FOCUS-SHIFT CHECK (APERTURE (AMOUNT OF SPHERICAL
ABERRATION))”.
2. Checking Method
1)
Check the focus-shift (amount of spherical aberration) at the WIDE end (16mm) and confirm that the focus-shift satisfies the
specification below.
2)
Check the focus-shift (amount of spherical aberration) at the TELE end (35mm) and confirm that the focus-shift satisfies the
specification below.
Specification
F8 focus-shift (mm) at WIDE end (16mm) = -0.09 to +0.11
F8 focus-shift (mm) at TELE end (35mm) = -0.09 to +0.11
3)
Considering the check result, perform “4-6-2. Focus-shift (Aperture (Amount of Spherical Aberration)) Adjustment”.
4-6-2. Focus-shift (Aperture (Amount of spherical aberration)) Adjustment
Perform “
4-8-4
.
2
SB Check/ Write
2
SB”, using the lens adjustment program.
Ver. 1.1 2009.02
The changed portions from
Ver. 1.0 are shown in blue.
Ver. 1.0 are shown in blue.
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