Sony SAL85F28 Service Manual ▷ View online
4-3
SAL85F28 (2.8/85 SAM) (85mm F2.8 SAM)
4-2. APERTURE DIAMETER CHECK/ADJUSTMENT
4-2-1. Aperture Diameter Check
Equipment
Luminance Box
Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
AE Master Lens
Memory Card
Personal Computer (Color Calculator 2 installed)
Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
AE Master Lens
Memory Card
Personal Computer (Color Calculator 2 installed)
1. Preparations
Note:
Confirm the checking lens by complete.
1) Install the memory card to the camera.
2) Set the equipment, camera and AE master lens as shown in Fig. 4-2-1.
2) Set the equipment, camera and AE master lens as shown in Fig. 4-2-1.
Luminance box
Luminance: EV12
Luminance: EV12
Camera
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
Master lens or checking lens
Focus: Infinity end
Focus: Infinity end
Shoot the center of the luminance surface
Fig.
4-2-1
3) Shoot the images under the following conditions and save them.
Note:
Shoot the center of the luminance surface three times with the AE master lens and checking lens.
Setting of Luminance box:
Luminance:
EV12
Setting of Lens:
Focus:
Infinity end
Setting of Camera:
ISO:
100
Exposure Mode:
M
Shutter Speed:
1/125
Aperture:
F5.6
Focus Mode:
MF
Metering:
Center weighted
Preset white balance:
Tungsten
D-R:
OFF
•
•
•
•
•
•
•
•
•
2. Checking of Image
Note:
Check the image of both AE master lens and checking lens.
1) Start the Color Calculator 2.
Fig.
4-2-2
2) Read the image from the file menu.
⇒
Fig. 4-2-3
3) Set the Color Calculator 2 as follows.
Measured value display (Display menu): RGB+L*a*b*
Measuring method (Display menu):
Center Single Area
Fig.
4-2-4
Color space (Edit menu): sRGB
Fig.
4-2-5
Area size for calculate (Edit menu
→
Option): 256
×
256 Pixels
Fig.
4-2-6
4-4
SAL85F28 (2.8/85 SAM) (85mm F2.8 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
•
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
•
•
•
•
•
•
•
•
4-5
SAL85F28 (2.8/85 SAM) (85mm F2.8 SAM)
2) Attach the checking lens to the lens test projector, and set the equipment as shown in Fig. 4-3-2.
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.
4-3-2
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.
4-3-3
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. 4-3-4.
Fig. 4-3-4.
Do not confuse spurious resolution for the smallest pitched lines.
Correct resolution
Spurious resolution
Fig.
4-3-4
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 4-3-1.
5) Switch the switch knob of the switch panel block of inspecting lens to MF .
Specification
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
85
3.40
100 lines or
greater
50 lines or
greater
50 lines or
greater
40 lines or
greater
40 lines or
greater
Table
4-3-1
6) Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform 4-3-2. Projective
Resolving Power (Partial Blur) Adjustment .
4-3-2. Projective Resolving Power Adjustment
Adjusting Method
1) Disassemble or assemble the checking and make it in the state shown in Fig. 4-3-5.
1) Disassemble or assemble the checking and make it in the state shown in Fig. 4-3-5.
Ornamental Tube
Focus Rubber
Mount,
Main PC Board Assy
Main PC Board Assy
Fig.
4-3-5
2) Replace the rear frame assy. If the projective resolving power is not improved according, perform step 3).
Front Frame Assy, Rear Frame Assy,
Filter Screw Frame, Outer Tube
Filter Screw Frame, Outer Tube
Rear Frame Assy
Front Frame Assy
Outer Tube
Filter Screw Frame
Fig.
4-3-6
4-1-2. Adjustment Flow Chart
4-6
SAL85F28 (2.8/85 SAM) (85mm F2.8 SAM)
4-4. FLANGE BACK (f F) CHECK/ADJUSTMENT
Equipment
1000 mm collimator
Flange back tester
A-mount attachment
Flange back gauge (43.50 mm)
Flange back tester
A-mount attachment
Flange back gauge (43.50 mm)
4-4-1. Flange Back (f F) Check
1. Preparations
1) Set the equipment as shown in the Fig. 4-4-1.
1) Set the equipment as shown in the Fig. 4-4-1.
Flange back gauge (43.50 mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Fig.
4-4-1
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 (43.50 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.
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.
Note:
Turn the knob in the direction of the arrow of Fig. 4-4-2 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.
4-4-2
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.
6) 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.
1) Set the focus to the over-infinity end and confirm that the specification is satisfied.
Specification (Over-infinity end)
Focal length f (mm)
Flange back value f F (mm)
85
44.82 –0.1 (44.72 to 44.87)
+0.05
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 .
4-4-2. Flange Back (f F) Adjustment
1. Preparation
1) Perform 4-4-1. Flange Back (f F) Check and confirm that the flange back (f F) does not satisfy the specification in Table 4-4-1.
2) Remove the interception.
1) Perform 4-4-1. Flange Back (f F) Check and confirm that the flange back (f F) does not satisfy the specification in Table 4-4-1.
2) Remove the interception.
2. Adjusting Method
1) Set
1) Set
to 44.82 mm by rotating the knob of flange back tester.
2) Set the focus to the infinity end.
3) Loosen three screws fixing the helicoids male.
4) Adjust the focus by moving up the helicoids male (clockwise) of the checking lens or moving it down (counterclockwise).
5) Tighten three screws which are loosened in step 3).
3) Loosen three screws fixing the helicoids male.
4) Adjust the focus by moving up the helicoids male (clockwise) of the checking lens or moving it down (counterclockwise).
5) Tighten three screws which are loosened in step 3).
Focus Ring
Screws
Ornamental Tube
Switch Panel Block
Move down the Helicoid
Move up the Helicoid
Fig.
4-4-3
6) Perform 4-4-1. Flange Back (f F) Check and repeat steps 1) to 5) until the specification is satisfied.
4-1-2. Adjustment Flow Chart
Click on the first or last page to see other SAL85F28 service manuals if exist.