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4-7
SAL50F14Z (Planar 1,4/50 ZA) (Planar T*50mm F1.4 ZA SSM)
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.
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 = 15)
Peripheral (y = 18)
S
M
S
M
50
2.0
125 lines or greater 40 lines or greater
50 lines or greater
50 lines or greater
40 lines or greater
Table 4-4-1
5) Check the projective resolving power. If the projective resolving power does not satisfy the specification, perform 4-4-2. Projective Re-
solving Power Adjustment (One Side Blur Adjustment) .
4-4-2. Projective Resolving Power Adjustment (One Side Blur Adjustment)
Note:
Check the projective resolving power. If it does not satisfy the specification, perform projective resolving power (one side blur) adjustment.
1. Adjustment method
1) Remove the adhesive bond and loosen the screws fixing the 2nd Group Lens Block Assy.
1) Remove the adhesive bond and loosen the screws fixing the 2nd Group Lens Block Assy.
CL-048 Board
2nd Group Lens Block Assy
2nd Group Lens
Block Assy
Block Assy
Remove the
adhesive bond
adhesive bond
Remove the adhesive bond
Remove the
adhesive bond
adhesive bond
Remove the
adhesive bond
adhesive bond
Fig.
4-4-5
2) Remove the three screws and turn the 2nd Group Lens Block Assy with 1/3 turn to shift position, and install it.
2nd Group Lens Block Assy
Fig.
4-4-6
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