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4-5
SAL35F18 (DT 1.8/35 SAM) (DT 35mm F1.8 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
30
2.10
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
Filter Screw Frame
Rear Frame Assy
Front Frame Assy
Filter Screw Frame
Fig.
4-3-6
4-1-2. Adjustment Flow Chart
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