Read Sony SAL35F18 Service Manual online
4-4
SAL35F18 (DT 1.8/35 SAM) (DT 35mm F1.8 SAM)
4) Click the Calculate button to measure the image.
5) After measuring, check the G values.
Average
5) After measuring, check the G values.
Average
G value of the three images shoot with master lens:
(a)
Average
G value of the three images shoot with checking lens: (b)
Calculate button
Check the “G” value
Fig.
4-2-7
3. Checking Method
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
Aperture error = Average G value of checking lens (b) - Average G value of master lens (a)
Specification:
Aperture error = 0
±
12
2) When the aperture error is out of specification, perform 4-2-2. Aperture Diameter Adjustment .
4-2-2. Aperture Diameter Adjustment
Equipment (Only the specific equipment is listed.)
Adhesive Bond (B-10)
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
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.
Main Unit Assy
Preset Lever
Screws
Apply the
grease(B-10)
grease(B-10)
Fig.
4-2-8
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.
5. After finishing the adjustment, apply the adhesive bond (B-10) to the indicated portions of two screws which are tightened in step 3.
4-1-2. Adjustment Flow Chart
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4-3. PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
4-3-1. Projective Resolving Power Check
Setting of Lens Test Projector.
Equipment
Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
Note:
Note:
Connect the variable transformer (Output voltage: AC 100 V) to the lens test projector.
A-mount Attachment
Screen (Art paper)
Tape Measure
Plane Mirror (For SLRs)
Screen (Art paper)
Tape Measure
Plane Mirror (For SLRs)
1. Preparations
1) Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal
1) Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal
length.
(1) Open the lid of the lens test projector.
(2) Pull up and turn the fixed levers on the right and left sides of the lens test projector.
(3) Remove or insert the lens.
(1) Open the lid of the lens test projector.
(2) Pull up and turn the fixed levers on the right and left sides of the lens test projector.
(3) Remove or insert the lens.
Note:
Be sure to have the right position and direction of the lens.
Lens test projector
Incorporate of the lenses
according to the checking focal-length (f).
according to the checking focal-length (f).
Lens
Fixed lever
Fixed lever
Lid
f=18 to 35 mm
f=35 to 100 mm
f=100 to 200 mm
f=200 to 300 mm
Heat-absorbing filter
Chart
Chart
Chart
Chart
Filament
Filament
Filament
Filament
Fig.
4-3-1
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