SAL18135 - Sony Digital Camera Service Manual (repair manual). Page 16

4-4

SAL18135 (3.5-5.6/18-135 SAM) (DT18-135mm F3.5-5.6 SAM)

4)  Click the Calculate button to measure the image.
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

3. Checking Method
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) 

 

Aperture error = 0 

±

 12

2)  When the aperture error is out of specification, perform  4-2-2. Aperture Diameter Adjustment .

Equipment (Only the specific equipment is listed)
•  Adhesive bond (B-10)

1. Adjustment Method
1)  Detach the rear light interception tube (8948).
2)  Move the preset ring lever (preset lever) to fix the preset ring at the position where the aperture is open.

Rear Cover Barrel (8948)

3)  Move the preset ring right and left by slightly unscrewing the 2 screws and move them laterally.
4)  Move the 2 screws right and left, looking into the light source from the rear ball side, time-tune aperture diameter in mind aperture er-

ror, and tighten two screws.

Apply the bond
(B-10)

Two screws

5) Perform the 4-2-1. Check of Aperture Diameter  and repeat steps 1) to 4) until the aperture tolerance meets the specification.
6)  After completing the adjustment, apply bond (B-10) to heads of 2 screws tightened in step 4).

Setting of the Flange Back (f F) measuring instrument.

Equipment
•  1000 mm Collimator
•  Flange Back Tester
• A-mount Attachment
•  Flange Back Gauge (43.50 mm)

1. Preparations
1)  Set the equipment as shown in the Fig. 4-3-1.

 

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