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LENS GENERAL ADJUSTMENT GUIDE
4-2.
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).
Fig.4-2-1
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).
Note:
The measurement position differs in model. Refer to the service manual of each model.
Read the number of the smallest pitched lines (both sagittal and meridional: 3 lines) at the peripheral point.
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.4-2-2.
Do not confuse spurious resolution for the smallest pitched lines.
Fig.4-2-2
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.
Specification:
It differs in model. Refer to the service manual of each model.
5)
In the confirmation of the projective resolving power, if the specification is not satisfied, perform the adjustment.
Note:
The adjustment procedure/specification differs in model. Adjust, referring to the service manual of each model.
The number represents for lines per mm.
Sagittal (S)
Meridional (M)
Correct resolution
Spurious resolution
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