Sony SAL50F18 Service Manual ▷ View online
4-4
SAL50F18 (DT 1.8/50 SAM) (DT 50mm F1.8 SAM)
4-2.
APERTURE DIAMETER CHECK/ADJUSTMENT
Equipment (Only the specific equipment is listed.)
• Adhesive Bond (B-10)
4-2-1. Aperture Diameter Check
1.
Perform “LENS GENERAL ADJUSTMENT GUIDE 2. Aperture Diameter Check”.
Specification: Aperture Tolerance = 0
±
20
2.
If the aperture tolerance does not satisfy the specification, perform “4-2-2. Aperture Diameter Adjustment”.
4-2-2. Aperture Diameter Adjustment
1.
Set the preset lever to the open of aperture by moving the lever (preset lever) of preset ring and fix it there.
2.
Loosen two screws and move them left and right so that the function lever can be moved right and left.
3.
Move two screws right and left while observing the light source from the rear lens so that the blades of aperture are completely
hidden by the neighboring frame. Then, tighten two screws at this position.
Fig.4-2-1
4.
Perform “4-2-1. Aperture Diameter Check” and repeat steps 1 to 3 until the aperture tolerance satisfies the specification.
5.
After finishing the adjustment, apply the adhesive bond (B-10) to the indicated portions of two screws which are tightened in step 3.
Preset Lever
Four Screws
Apply the adhesive
bond (B-10)
bond (B-10)
Main Unit Assy
4-1-2. Adjustment Flow Chart
4-5
SAL50F18 (DT 1.8/50 SAM) (DT 50mm F1.8 SAM)
4-3.
PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
Equipment (Only the specific equipment is listed.)
• Adhesive bond (B-10)
4-3-1. Projective Resolving Power Check
1.
Perform “LENS GENERAL ADJUSTMENT GUIDE 4. PROJECTIVE RESOLVING POWER CHECK”.
Specification
Focal length
Distance (m)
Number of the smallest pitched lines (lines/mm)
f (mm)
Center (y' = 0)
Peripheral (y' = 9)
Peripheral (y' = 12)
S
M
S
M
50
3.0
100 lines or
50 lines or
50 lines or
40 lines or
40 lines or
greater
greater
greater
greater
greater
Table 4-3-1
2.
Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform “4-3-2. Projective
Resolving Power Adjustment”.
4-1-2. Adjustment Flow Chart
4-6
SAL50F18 (DT 1.8/50 SAM) (DT 50mm F1.8 SAM)
4-3-2.
Projective Resolving Power Adjustment
Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform the projective resolving
power adjustment.
1. Adjusting Method
1)
Disassemble or assemble the checking lens and make it in the state shown in Fig. 4-3-1.
Fig.4-3-1
2)
Remove the three bolt screws fixing the helicoid male to the filter screw frame.
3)
Remove three screws fixing the rear group lens assy to the filter screw frame.
Fig.4-3-2
4)
Remove three screws fixing the front group assy and the rear group assy, and assemble by rotating the front group assy every 120
°
.
Fig.4-3-3
5)
Perform “4-3-1.projective resolving power check”.
Note:
Even if the 120
°
rotation adjustment is performed, the specification is not satisfied, replace the front group assy.
If the specification is not improved, replace the rear group assy.
6)
Repeat steps 4) and 5) until the projective resolving power specification is satisfied.
Interception
Focus Rubber
Mount,
Main PC Board
Main PC Board
Filter Screw Frame,
Outer Tube
Outer Tube
Bolt Screws
Front Group Assy,
Rear Group Assy
Rear Group Assy
Helicoid Male
Front Group Assy
Rear Group Assy
4-1-2. Adjustment Flow Chart
4-7
SAL50F18 (DT 1.8/50 SAM) (DT 50mm F1.8 SAM)
4-4.
FLANGE BACK (f’F) CHECK/ADJUSTMENT
Equipment
• 1000 mm collimator
• Flange back tester
• A-mount attachment
• Flange back gauge (43.50mm)
4-4-1.
Flange Back (f’F) Check
1. Preparation
1)
Perform “LENS GENERAL ADJUSTMENT GUIDE 3. FLANGE BACK (f’F) and OPTICAL AXIS CHECK”.
2)
Switch the switch knob of the switch panel block of inspecting lens to “MF”.
2. Checking Method
1)
Set the focus to the over-infinity end and confirm that the specification
is satisfied.
Specification (Over-infinity end)
Focal length (mm)
Flange back value f’F(mm)
50
44.82
±
0.1 (44.72 to 44.92)
Table 4-4-1
2)
If the flange back value (f’F) of the inspecting lens does not satisfy the value in the Table 4-4-1, perform “4-4-2. Flange Back (f’F)
Adjustment”.
4-1-2. Adjustment Flow Chart
Ver. 1.1 2009.06
The changed portions from
Ver. 1.0 are shown in blue.
Ver. 1.0 are shown in blue.
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