Read Sony SAL500F80 Service Manual online
4-13
SAL500F80 (REFLEX 8/500) (500mm F8 Reflex)
2. Checking Method
1)
Attach the checking lens to the flange back tester, and set the collimator (1500 mm or longer).
Fig.4-2-3
2)
Turn the focusing knob of the flange back tester so that the dial gauge indicates ‘“44.58 mm”.
When turning the focusing knob of the tester, chart image check is not required.
3)
Turn the helicoid unit of the checking lens until the image is the sharpest (red and green areas are equal on the chart*).
*:
Position in which the color of the collimator chart changes from green into red and come into focus.
Note:
Figure shows an example. The cause depends on individual lens.
Fig.4-2-4
4)
Turn the focusing knob of the flange back tester, and check that the difference of the dial gauge value from the start of color change
(green to red, or red to green) at a point on the chart, to entire color change (red or green) of its periphery meets the following
specification.
Off center: 0.3 mm or less
5)
Check the difference of the dial gauge value from the start of color change (green to red, or red to green) at symmetrical two points
on the chart to entire color change (red or green) of those peripheries meets the following specification.
Astigmatism: 0.3 mm or less
6)
When the optical axis of the checking lens is out of the specifications, perform the “4-2-2. Optical Axis Adjustment”.
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.
Collimator (1500 mm or longer)
Checking lens
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