SEL2470GM (FE 2.8 / 24-70 GM) (FE 24-70mm F2.8 GM)
4-13E
4-8. PHOTOGRAPHIC/PROJECTIVE RESOLVING POWER (CURVATURE) ADJUSTMENT
1. Adjust the curvature of field by increasing or decreasing of Back Washer (9137).
6th Group Block Assy
Back Washer (9137)
Back Washer (9137)
Fig.
4-8-1
4-9. FLANGE BACK CHECK
Equipment and Tools
• Flange back adjustment jig (J-6082-563-A)
• Siemens star chart (J-6080-875-A)
• Camera (ILCE-5000)
• 40 inch LCD monitor (Full HD)
4-9-1. Flange Back Check
1. Perform “3. FLANGE BACK CHECK” of “E-MOUNT LENS GENERAL ADJUSTMENT GUIDE”.
Capture conditions:
Capture a moving image by operating the zoom as shown below.
Zoom: 70 mm
→
50 mm
→
35 mm
→
24 mm
→
35 mm
→
50 mm
→
70mm
2. Play back the movie captured on a LCD monitor. Replace the Optical Block For Service when there is notable image blur, center shifting, image
shaking or image jumping.
4-6-2. Projective Resolving Power Check
Equipment and Tools
• Lens Test Projector (J-6082-778-A) and Variable Transformer (Output voltage: AC 100 V)
Note:
Connect the variable transformer (Output voltage: AC 100 V) to the Lens Test Projector.
• Screen (Art paper)
• Tape measure
• Plane mirror (For SLRs)
Checking Method
1. Perform “2. PROJECTIVE RESOLVING POWER CHECK” of “E-MOUNT LENS GENERAL ADJUSTMENT GUIDE”.
Reference value:
Focal length f
(mm)
Distance (m)
Number of the smallest pitched (lines/mm)
Center (y’ = 0)
Peripheral (y' = 15)
Peripheral (y' = 18)
S
M
S
M
24
0.96
More than
80 lines
More than
40 lines
More than
40 lines
More than
25 lines
More than
25 lines
35
1.4
Table
4-6-1
2. The photographic/projective resolving power check is performed, but the specification is not satisfied, perform the " 4-7. PHOTOGRAPHIC/
PROJECTIVE RESOLVING POWER (PARTIAL BLUR) ADJUSTMENT or 4-8. PHOTOGRAPHIC/PROJECTIVE RESOLVING POWER
(CURVATURE OF FIELD) ADJUSTMENT.
4-7. PHOTOGRAPHIC/PROJECTIVE RESOLVING POWER (PARTIAL BLUR) ADJUSTMENT
Equipment and Tools
• Photographic resolving power check chart (J-6082-781-A)
• Camera (ILCE-7 series)
• 40 inch LCD monitor (Full HD)
* When checking/adjusting, magnify the photography image and check the resolution.
1. Remove the Zoom Rubber Ring and the Guard Tape Z referring to "2-1.DISASSEMBLY".
2. Attach the checking lens to the camera, set the shooting mode to aperture priority mode and set the aperture value to the open.
3. Set the camera at a shooting distance of 1000 mm between the imager surface and photographic resolving power check chart and set the zoom at
the WIDE end.
4. Focus to make the chart aligned equally in all directions.
5. Turn the two adjustment screws (white color) by the flat-blade screwdriver and adjust the partial blur.
6. If the specification of Fig.4-6-2 is satisfied, apply the adhesive bond (B-110) to two bond application ditches.
Bond Application
Groove
Apply adhesive
bond (B-110)
Adjustment
Screws (White)
Adjustment
Screws (White)
Bond Application
Groove
Apply adhesive
bond (B-110)
Fig.4-7-1
Back Washer (9137)
Part No.
Thickness t (mm)
4-587-823-01
0.076 ± 0.1
Table 4-8-1
