Sony SAL2470Z Service Manual ▷ View online
4-16
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
k
k
k
k
k
2. Checking of Image
Note:
Check the image of both AE master lens and checking lens.
1)
Start the Color Calculator 2.
Fig.4-2-2
2)
Read the image from the file menu.
Fig.4-2-3
3)
Set the Color Calculator 2 as follows.
Measured value display (Display menu): RGB+L*a*b*
Measuring method (Display menu):
Center Single Area
Fig.4-2-4
Color space (Edit menu): sRGB
Fig.4-2-5
Area size for calculate (Edit menu
→Option): 256×256 Pixels
Fig.4-2-6
4-17
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
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)
Fig.4-2-7
3. Checking Method
1)
Calculate aperture error using the following formula, and check that the aperture error is within the specification.
Average “G” value of checking lens (b) - Aperture error = Average “G” value of master lens (a)
Specification
Aperture error = –25 to 0 (Wide end: 24mm)
2)
When the aperture error is out of specification, perform “4-2-2. Aperture Diameter Adjustment”.
Calculate button
Check the “G” value
4-18
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
4-2-2. Aperture Diameter Adjustment
Since the aperture blades remain a little in the optical path when the lens is set to the open F value, the aperture diameter changes when
zoom-operated. Therefore, adjust in the procedure below.
Equipment
• Adhesive bond (B-10)
• Maxium Aperture Jig
• Universal Wrench
• Chip-A for Universal Wrench
• Chip-B for Universal Wrench
• 2gun Tightering JIG
1. Preparation
1)
Remove parts indicated in Fig.4-2-8 from the lens unit.
2)
Set the zoom to 70mm.
3)
Install the maximum aperture jig and open the aperture.
Fig.4-2-8
1st lens Assy
Cam ring Light Shiled Barrel
2nd Lens Assy
4-19
SAL2470Z (Vario-Sonnar 2.8/24-70 ZA) (Vario-Sonnar T
*
24-70mm F2.8 ZA SSM)
2. Adjustment Procedure
1)
Rotate the aperture block from the lens front so that the aperture blades are hidden behind the aperture hold ring.(Fig.4-2-9)
2)
Remove the maximum aperture jig once. Then, install the maximum aperture jig again and confirm the position of aperture blades.
3)
Confirm the aperture tolerance. Repeat the confirmation and adjustment until the aperture tolerance meets the specification.
4)
After completing the adjustment, apply the adhesive bond (B-10) to the four indicated locations (width in 10mm).(Fig.4-2-9)
Fig.4-2-9
Aperture Block
Aperture Hold Ring
Aperture Hold Ring Spring
Apply the adhesive bond (B-10)
Apply the adhesive bond (B-10)
Click on the first or last page to see other SAL2470Z service manuals if exist.