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4-11
SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
4-3-2. 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.4-3-5.
Fig.4-3-5
2)
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.
3)
Turn the focusing knob of the tester until the flange back (f’F) of the checking lens is “44.58 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 focus ring is fully turned, perform the following steps (1) to (4) and
shift the position of the focus stop plate. (Refer to Fig.4-3-6.)
(1) Set the focusing ring to the infinity stop position, and hold the focus ring.
(2) Loosen the three screws fixing the focus stop plate.
(3) Turn the helicoid in the direction of the arrow (screw in direction), and tighten the three screws loosened in step (2) tentatively.
(4) Perform the step 4) again.
5)
Loosen the three screws fixing the focus stop plate, contact the focus stop plate to focus ring and tighten the three screws.
6)
Apply the adhesive bond (B-10) to head of three screws shown in figure.
Fig.4-3-6
7)
Check that the focus ring moves smoothly from minimum distance to infinity, and perform “4-3-1. Flange Back (f’F) Check” again.
8)
After the adjustment is completed, affix the focus scale plate. (Refer to HELP04)
1.5
0.5
0.3
0.8
0.7
0.25
0.2
∞
Focus stop Plate
Apply the adhesive bond(B-10)(3 areas)
∞
1.5
0.5
0.3
0.8
0.7
0.25
0.2
Focus Scale Plate
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