Sony SAL85F14Z Service Manual ▷ View online
4-13
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
4-2.
APERTURE DIAMETER CHECK/ADJUSTMENT
4-2-1. Aperture Diameter Check
Equipment
• Luminance Box
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC)
(Color Calculator 2 installed)
1. Preparations
Note:
Confirm the checking lens by complate. (The adjustment of focus brush is completed.)
1)
Install the CF card to the camera.
2)
Set the equipments, camera and master lens as shown in Fig.4-2-1.
Fig.4-2-1
3)
Shoot the images under the following conditions and save them.
Note:
Shoot the center of the luminance surface three times with the master lens and checking lens.
Setting of Luminance box:
Luminance:
EV12
Setting of Lens:
Focus:
Infinity end
Setting of Camera:
ISO:
100
Exposure Mode:
M
shutter Speed:
1/125
Aperture:
F5.6
Focus Mode:
MF
Metering:
Center weighted
Preset white balance: Tungsten
D-R:
OFF
Luminance box
Luminance: EV12
Luminance: EV12
Camera
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
Master lens or checking lens
Focus: Infinity end
Focus: Infinity end
Shoot the center of the luminance surface
Ver. 1.4 2008.01
The changed portions from
Ver. 1.3 are shown in blue.
Ver. 1.3 are shown in blue.
4-14
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
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2. Checking of Image
Note:
Check the image of both 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
4-15
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
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 = 0
±12
2)
When the aperture error is out of specification, perform “4-2-2. Aperture Diameter Adjustment”.
Calculate button
Check the “G” value
Ver. 1.4 2008.01
The changed portions from
Ver. 1.3 are shown in blue.
Ver. 1.3 are shown in blue.
4-16
SAL85F14Z (Planar 1.4/85) (Planar T
*
85mm F1.4 ZA)
4-2-2. Aperture Diameter Adjustment
Equipment
• Luminance Box
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC) (Color Calculator 2 installed)
• Adhesive bond (B-10)
1. Preparations
1)
Separate all lens elements in front of the
aperture blade unit
(subject side). (Refer to Section 2-1-1.)
2)
Remove the adhesive bond fixing the
aperture unit holding spring
(3 areas).
3)
Confirm the aperture error of checking lens. (Refer to Section 4-2-1.)
2. Adjustment Method
1)
Turn the aperture unit holding ring to change aperture diameter of the
aperture blade unit
.
Fig.4-2-8
2)
Repeat check and adjustment until the aperture error is within the standard.
3)
After adjustment, apply the adhesive bond (B-10), and fix the
aperture unit holding spring
.
Fig.4-2-9
4)
Assemble the lens completely, perform “4-2-1. Aperture Diameter Check”.
Note:
Repeat “4-2-2. Aperture Diameter Adjustment” and “4-2-1. Aperture Diameter Check”,until the aperture error meets the
specification.
Adjustment that use this hole
Turn to right : Aperture open
Turn to left : Aperture close
Turn to right : Aperture open
Turn to left : Aperture close
Aperture Unit Holding Ring
Aperture Unit Holding Spring
Apply the adhesive bond (B-10) (width of 5 to 10mm)
Aperture Unit Holding Spring
Ver. 1.3 2007.10
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
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