Adjustment Of Back-Focus - Nikon AF-S VR Zoom-Nikkor ED 24-120mm f/3.5-5.6G IF Repair Manual

ADJUSTMENT (DIVISION) OF FOCUS MOVEMENT (TELE, WIDE)
● Align the infinity (∞) mark of the focus ring with the index.
● Fix the aperture lever so that the aperture is fully opened.
[2nd group washer]
1. Read each value on the 70 mm and WIDE sides.
2. Calculate as follows:
Ａ － Ｂ ＝ Ｃ
3. Adjust the thickness of the washer (#57) for the above amount of C value. If C is positive, thicken the
washer. If negative, thin the washer.
[1st group washer]
1. Read each value on the TELE and WIDE sides.
2. Calculate as follows:
Ａ － Ｂ ＝ Ｃ
3. Adjust the thickness of the washer (#86) for the above amount of C value. If C is positive, thicken the
washer. If negative, thin the washer.
Caution：When putting in washers, place a thin washer between thick washers.

ADJUSTMENT OF BACK-FOCUS

1. Align the infinity (∞) mark of the focus ring with the index.
2. Fix the aperture lever so that the aperture is fully opened.
3. Read each value of WIDE or TELE side.
4. Remove the bayonet mount.
5. Adjust the thickness of the washer (#125) for the difference from the standard value. If the difference value is
positive, thicken the washer. If negative, thin the washer.
Ａ＝ Value of 70 mm side
Ｂ＝ Value of WIDE side
Ｃ＝ Adjustment amount (mm) of the 2nd lens group washer (#57)
Ａ＝ Value of TELE side
Ｂ＝ Value of WIDE side
Ｃ＝ Adjustment amount (mm) of the 1st lens group washer (#86)
Focal length（ｆ）
２４ｍｍ －０． ０５～＋０． ０６
５０ｍｍ －０． ０７～＋０． １７
７０ｍｍ －０． ０７～＋０． １７
１２０ｍｍ －０． １０～＋０． ２２
- L25 ･ AF-S VR24-120/3.5-5.6G -
Standard（ｍｍ）
INC
JAA78271-R.3598.A