Sony SAL55300 Service Manual ▷ View online
4-5
SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)
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 sharp-
est.
3) Attach the flange back gauge (43.50 mm) 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 (43.50 mm) is the sharpest.
4) Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50 mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig. 4-3-2 for correct reading.
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction 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.
4-3-1. Optical Axis Check
1) Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
1000 mm collimator
Checking lens
Fig.
4-3-3
2) Set the focus ring of the checking lens to
∞
(infinity) index or near
∞
(infinity) and adjust the optical axis, observing the microscope
so that the chart can be seen in the center.
3) Turn the focusing knob of the flange back tester until the chart image comes into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig. 4-3-4.)
Note:
Note:
Figure shows example. The cause depends on individual lens.
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.
Fig.
4-3-4
4) Perform Step (1) through Step (6) and ensure that the AS and CB values are within specifications.
Note:
If the specification is CB only, steps 1 to 3 are not required.
AS
(astigmatism)
The phenomenon where the flare on the ring chart appears in a cruciform shape with the ring chart in the sharpest focus. (Fig. 4-3-5 (a))
(1) Turn the focusing knob until the flare becomes minimum between two approximately opposite points on the ring chart edge (as
shown with the arrows in Fig. 4-3-5 (b)), and then read the dial gauge value. <A>
(2) Turn the focusing knob until the flare becomes minimum between two points with the phase of the flare rotated by 90 degrees
from the above condition (as shown with two arrows in Fig. 4-3-5 (c)), and then read the dial gauge value. <B>
(3) Calculate the AS value (absolute difference between <A> and <B>) and ensure that it is within specifications.
AS value = <A> - <B>
CB (Center Blur)
The phenomenon where the flare on the ring chart trails in one direction with the ring chart in the sharpest focus. (Fig. 4-3-5 (d))
(4) Turn the focusing knob until the ring chart edge in the direction of the maximum flare is in the sharpest focus (as shown with
the arrow in Fig. 4-3-5 (e)), and then read the dial gauge value. <C>
(5) Turn the focusing knob until the ring chart edge, opposite 180 degrees from the above condition (as shown with the arrow in Fig.
4-3-5 (f)) is in focus, and then read the dial gauge value. <D>
(6) Calculate the CB value (absolute difference between <C> and <D>) and ensure that it is within specifications.
CB value = <C> - <D>
(1)
(1)
(2)
(2)
(5)
(4)
AS
E
D
F
H
G
I
CB
Fig.
4-3-5
Specification (TELE end)
Specification (WIDE end)
CB (center blur)
0.19 mm or less
CB (center blur)
0.13 mm or less
AS (AS ion the axis)
0.13 mm or less
AS (AS ion the axis)
0.09 mm or less
Table
4-3-1
5) If the optical axis does not meet the specification, perform 4-3-2. Optical Axis Adjustment .
4-6
SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)
4-3-2. Optical Axis Adjustment
1. Check the direction of the center blur at the TELE end (300 mm).
2. Detach the Rear Light Shield Barrel.
2. Detach the Rear Light Shield Barrel.
Screws
Screw
Rear Light Shield Barrel
Contact Board Assy
Screws
Fig.
4-3-6
3. Set the zoom to the TELE end, slightly loosen the three screws, shift the G11-G12 frame to adjust it, and then tighten the three screws.
Screw
Screw
Screw
G11-G12 Frame
Fig.
4-3-7
4. Attach the Rear Light Shield Barrel and perform 4-3-1. Optical Axis Check again. Repeat steps 1) to 3) until the specification is met.
4-4. PROJECTIVE RESOLVING POWER (PARTIAL BLUR ADJUSTMENT) CHECK/
ADJUSTMENT
4-4-1. Projective Resolving Power Check
Setting of Lens Test Projector.
Equipment
• Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
• Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
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.
4-4-1
4-7
SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)
2) Attach the checking lens to the lens test projector, and set the equipment as shown in Fig. 4-4-2.
3) Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.
3) Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.
Distance
Lens test projector
Chart
Fan switch
Lamp switch
Plane mirror
Screen
A-mount attachment
Checking lens
F
L
Fig.
4-4-2
4) Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y = 0).
5) Set the plane mirror to the center of the projected image (y = 0), and adjust the projector position so that the mirror reflects the light to
5) Set the plane mirror to the center of the projected image (y = 0), and adjust the projector position so that the mirror reflects the light to
the center of the lens.
2. Projective Resolving Power Checking Method
1) Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y = 0).
2) Read the number of the smallest pitched lines at the center (y = 0).
1) Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y = 0).
2) Read the number of the smallest pitched lines at the center (y = 0).
The number represents for lines per mm.
Sagittal (S)
Meridional (M)
Fig.
4-4-3
3) Rotate the mount rotational plate of the lens projector while observing y = 9, y = 12, y = 15 or y = 18 and stop it at the location where
the projective resolving power is worst (low).
Read the number of the smallest pitched lines (both sagittal and meridional: 3 lines) at the peripheral point.
Note:
Note:
When reading the number of the smallest pitched lines, be careful of the spurious resolution.
Spurious resolution is the reversed image of 2 or 4 lines which appears on screen when focus is beyond maximum revolving power as shown
in Fig. 4-4-4.
in Fig. 4-4-4.
Do not confuse spurious resolution for the smallest pitched lines.
Correct resolution
Spurious resolution
Fig.
4-4-4
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.
Reference value:
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
55
2.2
80 lines or greater 32 lines or greater 32 lines or greater 20 lines or greater 20 lines or greater
70
2.8
100
4.0
200
8.0
300
12.0
Table
4-4-1
5) Check the projective resolving power. If the projective resolving power does not satisfy the Reference value, perform 4-4-2. Projective
Resolving Power Adjustment (Partial Blur Adjustment) .
4-4-2. Projective Resolving Power Adjustment (Partial Blur Adjustment)
1. Adjustment Method
1) Check the projective resolving power at the TELE end (300 mm) to check partial blur (both on the front focus side and rear focus side).
2) Remove the Zoom Rubber.
3) Remove the Zoom Rubber, Cover Tape A, Zoom Ring Plate, and Cover Tape B from three locations.
1) Check the projective resolving power at the TELE end (300 mm) to check partial blur (both on the front focus side and rear focus side).
2) Remove the Zoom Rubber.
3) Remove the Zoom Rubber, Cover Tape A, Zoom Ring Plate, and Cover Tape B from three locations.
Zoom Rubber
Cover Tape B
Zoom Ring Plate
Cover Tape A
Fig.
4-4-5
4-8
SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)
4) Set the zoom to the TELE end, slightly loosen the three screws, adjust tilt of the 2nd Group Assy, and then tighten the three screws.
Screw
Holes
Fig.
4-4-6
5) Perform 4-4-1. Projective Resolving Power Check again. Repeat steps 1) to 4) until the projective resolving power 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)
Preparation
1. Perform 1. Preparations of 4-3. OPTICAL AXIS CHECK/ADJUSTMENT .
1. Perform 1. Preparations 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 (300 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob of the flange back tester.
3) Adjust the focus by rotating the focus ring from the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that the specification is met at each focal distance.
1) Set the zoom to the TELE end (300 mm).
2) Set the flange back tester to 44.56 mm by rotating the knob of the flange back tester.
3) Adjust the focus by rotating the focus ring from the NEAR end.
4) By rotating the zoom from TELE to WIDE and from WIDE to TELE, check that the specification is met at each focal distance.
Note:
Do not rotate the focus ring.
Specification:
Focal length f (mm)
Flange back value f'F (mm)
55
44.50 to 44.62
70
44.41 to 44.71
100
44.36 to 44.76
200
300
44.46 to 44.66
Table
4-5-1
5) If the flange back value (f F) of the lens to be inspected does not meet the specification in Table 4-5-1, perform 4-5-2. Focus Shift (Fo-
cal Distance)/Flange Back (f F) Adjustment .
2. Flange Back (f F) Check
1) Set the zoom to the TELE end (300 mm) and then set 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 at this time.
1) Set the zoom to the TELE end (300 mm) and then set 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 at this time.
Specification
Focal length f (mm)
Flange back value f F (mm)
55
44.80 0.15 (44.65 to 44.95)
300
51.46 0.5 (50.96 to 51.96)
Table
4-5-2
3) If the flange back value (f F) of the lens to be inspected does not meet the specification in Table 4-5-2, perform 4-5-2. Focus Shift (Fo-
cal Distance)/Flange Back (f F) Adjustment .
4-5-2. Focus Shift (Focal Distance)/Flange Back (f F) Adjustment
1. Preparation
1) Perform 4-5-1. Focus Shift (Focal Distance)/Flange Back (f F) Check and check that the flange back (f F) at each focal distance does
1) Perform 4-5-1. Focus Shift (Focal Distance)/Flange Back (f F) Check and check that the flange back (f F) at each focal distance does
not meet the specification in Table 4-5-1.
Click on the first or last page to see other SAL55300 service manuals if exist.