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4-7
SAL18135 (3.5-5.6/18-135 SAM) (DT18-135mm F3.5-5.6 SAM)
4) Change the focal length and projected length of the checking lens. (In case of the zoom lens), project the S image and the M image at
each focal point/projected length and confirm that the number of resolution satisfies the specification of the Table 4-4-1.
Specification:
Focal length f
(mm)
Distance (m)
Number of the smallest pitched lines (lines/mm)
Center (y = 0)
Peripheral (y = 9)
Peripheral (y = 12)
S
M
S
M
18 (W)
1.08
100 lines or
greater
40 lines or
greater
32 lines or
greater
32 lines or
greater
25 lines or
greater
50 (M)
3.00
135 (T)
8.10
Table
4-4-1
5) Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform 4-4-2. Projective Re-
solving Power Adjustment (Partial Defocus Adjustment) .
4-4-2. Projective Resolving Power Adjustment
Check the projective resolving power. If it does not meet the specification, adjust the projective resolving power (partial defocus adjustment)
in the following procedure.
in the following procedure.
1. Detach the 1st lens sheet and the 1st lens ring.
2. Turn the 1st lens assy 120 degrees to assemble it and adjust the 1st lens assy.
2. Turn the 1st lens assy 120 degrees to assemble it and adjust the 1st lens assy.
1st Lens Assy
1st Lens Sheet (8948)
1st Lens Ring (8948)
120°
Fig.
4-4-5
3. If the projective resolving power does not meet the specification even by turning the 1st lens assy, replace the 1st lens assy.
4. If the specified value is still not met, replace the product.
4. If the specified value is still not met, replace the product.
For how to take actions, refer to 1-5. NOTE ON REPLACEMENT OF SERVICE EXCLUSIVE OPTICS BLOCK .
5. Recheck the projective resolving power and check that it meets the specification.
4-5. FOCUS SHIFT (FOCAL DISTANCE)/FLANGE BACK (F F) CHECK/ADJUSTMENT
This section describes how to check the focus shift generated when the focal length is changed by zooming and how to adjust the focus
shift and flange back.
shift and flange back.
Equipment
• 1000 mm collimator
• Flange back tester
•
• 1000 mm collimator
• Flange back tester
•
A-mount attachment
• Flange back gauge (43.50 mm)
• Adhesive Bond (B-110)
• Adhesive Bond (B-110)
Preparation
1. Perform 1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
1. Perform 1. Preparation of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
4-5-1. Focus Shift (Focal Distance)/Flange Back (f F) Check
1. Focus Shift (Focal Distance) Check
1) Set the zoom to the TELE end (135 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob.
3) Adjust the focus by rotating the focus ring, starting with the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that it meets the specification at each focal distance.
1) Set the zoom to the TELE end (135 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob.
3) Adjust the focus by rotating the focus ring, starting with the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that it meets the specification at each focal distance.
Note:
Do not rotate the focus ring.
Specification:
Focal length f (mm)
Flange back value f F(mm)
135
44.21 - 44.93
100
44.26 - 44.88
70
50
35
24
18
44.47 - 44.67
Table
4-5-1
5) In case that the flange back value (f F) does not meet the value in Table 4-5-1, perform 4-5-2. Focus Shift (Focal Distance)/Flange
Back (f F) Adjustment .
2. Flange Back (f F) Check
1) Set the zoom to the TELE end (135 mm) and the focus to the over infinity end.
2) Adjust the focus by rotating the knob of flange back tester and read the flange back value.
1) Set the zoom to the TELE end (135 mm) and the focus to the over infinity end.
2) Adjust the focus by rotating the knob of flange back tester and read the flange back value.
Specification (Over-infinity end)
Focal length f (mm)
Flange back value f F(mm)
135
48.60
±
0.59 (48.01 - 49.19)
18
44.74
±
0.08 (44.66 - 44.82)
Table
4-5-2
3) In case that the flange back value (f F) of checking lens does not meet the specification in Table 4-5-2, perform 4-5-2. Focus Shift (Fo-
cal Distance)/Flange back Adjustment .
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