Sony DSLR-A300X / DSLR-A350X / SAL55200 Service Manual ▷ View online
4-17
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
4-2-2. Aperture Diameter Adjustment
Equipment
• Luminance Box
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC)
(Color Calculator 2 installed)
• Adhesive bond (B-10)
1. Preparations
1)
Remove the rear light shield barrel.
Fig.4-2-8
2)
Set the zoom ring at the Wide end position.
3)
Move the preset lever to set the preset ring at the open aperture position.
Fig.4-2-9
Preset Lever
Open aperture position
Rear Light
Shield Barrel
Shield Barrel
4-18
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
2. Adjusting Method
1)
Let the operation lever of the preset ring move to left and right sides by loosening two screws slightly to move to left and right sides.
2)
Move the two screws while seeing the lights from the rear lens element side, and tighten two screws at the point where the diaphragm
blades are hidden into the edge completely.
Fig.4-2-10
3)
Perform “4-2-1. Aperture Diameter Check”, and repeat steps 1) to 3) until the aperture error is within the specification.
4)
After the adjustment is completed, apply the adhesive bond (B-10) to the two screws tightened in step 2).
Apply the adhesive bond (B-10)
(After adjustment)
(After adjustment)
Two Screws
4-19
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
4-3.
OPTICAL AXIS CHECK/ADJUSTMENT
4-3-1. Optical Axis Check/Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
1. Preparations
1)
Set the equipments as shown in the Fig.4-3-1.
Fig.4-3-1
2)
Looking through the eyepiece lens, turn the eyepiece ring of the flange back tester so that cross line or scale in the view is the sharpest.
3)
Attach the flange back gauge (43.50mm) securely to the A-mount attachment and hold them together.
4)
Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig.4-3-2 for correct reading.
Fig.4-3-2
5)
Turn the scale ring of the dial gauge until the long pointer indicates “0”.
Note:
This position is the flange back (f’F) = 43.50 mm.
Memorize the position of short-pointer.
flange back gauge (43.50mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction for correct reading.
4-20
SAL55200 (DT 4-5.6/55-200) (DT 55-200mm F4-5.6)
1000 mm collimator
Checking lens
2. Optical Axis Check/Adjustment
1)
Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Fig.4-3-3
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.4-3-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-3-4
4)
If the optical axis aligns the most unsharp, loosen the three screws shown in the Fig.4-3-5 and shift the 4th lens barrel-B assembly to
let the vertical and horizontal.
Fig.4-3-5
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.
Three Screws
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