Read Sony SAL85F14Z Service Manual online
4-25
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
4-5.
FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF SPHERICAL
ABERRATION))
ABERRATION))
This section describes the check/adjustment of focus-shift amount resulting change of focal-length by aperture setting.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Aberration measuring cap 72mm (SAL85F14Z)
1. Preparations
1)
Perform “1. Preparations” of “4-4-1. Flange Back (f’F) Check”.
2)
Set the checking lens focus to the infinite.
2. Checking Method
1)
Set the lens aperture to the open aperture position, and measure the flange back (f’F).
2)
Set the aberration measuring cap 72mm (F8 equivalent) on the tip of lens as shown in the Fig.4-5-1, then measure the flange back (f’F).
Fig.4-5-1
3)
Calculate amount of focus-shift using the following formula, and check that the specification is satisfied.
Note:
The focus-shift amount of the checking lens is difference between the flange back (f’F) of open aperture and flange back
(f’F) reading (using aberration measuring cap 72mm).
Flange back (f’F) reading (using aberration measuring cap 72mm) - Focus-shift = flange back (f’F) of open aperture reading
Specification
Focus-shift (mm) = +0.02 to +0.12
4)
When the focus-shift is out of specification, perform the parts replacement and adjustment/check referring to the Fig.4-5-2.
Fig.4-5-2
5)
Perform the “4-9. WRITE dSB”.
Aberration measuring cap 72mm (SAL85F14Z)
Replace the 2ND LENS
HOLDER BLOCK (A-1527-027-A)
4-4. FLANGE BACK (f'F)
4-5. FOCUS-SHIFT CHECK
CHECK/ADJUSTMENT
OK
NG
END
Replace the BLOCK, 1ST BALL
FRAME (B) LENS (A-1197-811-B)
4-4. FLANGE BACK (f'F)
4-5. FOCUS-SHIFT CHECK
CHECK/ADJUSTMENT
OK
END
Replace the G4
/
G5
(2-693-409-01)
4-4. FLANGE BACK (f'F)
4-5. FOCUS-SHIFT CHECK
CHECK/ADJUSTMENT
OK
END
NG
Ver. 1.5 2008.05
The changed portions from
Ver. 1.4 are shown in blue.
Ver. 1.4 are shown in blue.
Click on the first or last page to see other SAL85F14Z service manuals if exist.