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4-5-2. Optical Axis Adjustment
Preparations
1. Perform the "4-5-1 Optical Axis Check" to confirm that the optical axis of the checking lens does not satisfy the specification.
Adjustment Procedure
1. Remove the Zoom Rubber Ring and the Guard Tape Z referring to "2-1.DISASSEMBLY".
2. Set the lens to TELE end (70 mm) so that you can see the three adjustment screws (gold color) in the Zoom Ring Assy.
3. Attach the checking lens to the flange back tester referring to the steps 1 to 3 of "4-5-1. Optical Axis Check", set the 1000 mm collimator.
4. Adjust the three adjustment screws (gold color) by the flat-blade screwdriver so that the ring chart image becomes the center, while looking in the
1000 mm collimator.
5. Perform the "4-5-1. Optical Axis Check", make sure that the optical axis of checking lens satisfies the specification.
6. If the specification (reference value) is satisfied, apply the adhesive bond (B-110) to the three bond application ditches, and perform the "4-6.
PHOTOGRAPHIC/PROJECTIVE RESOLVING POWER CHECK".
Bond Application
Groove
Adjustment
Apply adhesive
Screw (Gold）
bond (B-110)
Bond Application
Groove
Adjustment
Apply adhesive
Screw (Gold）
bond (B-110)
Fig. 4-5-6
SEL2470GM (FE 2.8 / 24-70 GM) (FE 24-70mm F2.8 GM)
Bond Application
Groove
Adjustment
Apply adhesive
Screw (Gold）
bond (B-110)
4-4-1. Adjusting Procedure
4-6. PHOTOGRAPHIC/PROJECTIVE RESOLVING POWER CHECK
4-6-1. Photographic Resolving Power Check
Equipments and Tools
• Resolution Check Chart (ILC) (J-6082-813-A)
• Camera (ILCE-7 series)
• 40 inch LCD monitor (Full HD)
* When checking/adjusting, magnify the photography image and check the resolution.
Preparations
This lens must be checked the photographic resolving power in multiple focal length.
1. Set the Shooting Mode of the camera to the Aperture Priority mode and set the f-stop value to the minimum (open).
2. Set the focal length to confirm.
3. Set the camera at the position where a chart appears in the whole screen. Furthermore, move it to the 100 mm rear from that position.
1125mm x 750mm 3:2 2015.12.15 LENS Gp
0.8
0.6
0.5
0.3
0.3
0.5
0.6
Fig. 4-6-1
Checking Method
1. Set to manual focus on status that the "Preparations" condition.
2. Focus and shoot with self timer.
3. Keep focusing as step 2, change the object distance to the shooting distance position ± 100 mm of step 1, then shoot two times with self timer.
4. Check the three images to see if the resolution of the patterns in four corners meets the standard shown in Fig.4-6-2.
Note:
Check if the circle in the center is resolved clearly. Then, check to ensure the other circles (24 circles) are resolved symmetrically in vertical and horizontal
directions. (A circle and its counterpart on the diametrically opposite side are resolved equally.)
* Use Adobe Photoshop to check the image resolution.
*Check the center circle (red frame) and the other peripheral
circles (blue frame) at the same magnification.
1125mm x 750mm 3:2 2015.12.15 LENS Gp
0.8
0.6
0.5
0.3
0.3
0.5
Fig. 4-6-2
4-12
0.8
0.6
0.8
4-4-1. Adjusting Procedure
4-4-1. Adjusting Procedure
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