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4-4

SAL1635Z2 (Vario-Sonnar 2.8/16-35 ZA SSM II) (Vario-Sonnar T* 16-35mm F2.8 ZA SSM II)

2)  Loosen lightly two screws fixing the aperture connect fork of mount block assy.
3)  Fine-adjust by moving right or left the aperture connect fork, tighten two screws and apply the adhesive bond (B-10) to the indicated 

portions.

 

Apply the adhesive bond (B-10)

Aperture Connect Fork

Screw

Screw

Aperture Connect Fork

Mount Block Assy

4)  Assemble again and perform  4-2-1. Aperture Diameter Check . And repeat steps 1) to 3) until the aperture diameter satisfies the spec-

ification. If the aperture diameter does not satisfy the specification, replace the optics block assembly.

Setting of the Flange Back (f F) measuring instrument.

Equipment
•  1000 mm Collimator
•  Flange Back Tester
• A-mount Attachment
•  Flange Back Gauge (43.50 mm)
•  Adhesive bond (B-50)

1)  Set the equipment as shown in the Fig. 4-3-1.

 

flange back gauge (43.50 mm)

A-mount attachment

Objective lens (10x)

Dial Gauge (Min. scale: 0.01 mm)

Scale ring

Eyepiece lens (7x)

Eyepiece ring

2)  Looking through the eyepiece lens, turn the eyepiece ring of the flange back tester so that cross line or scale in the view is the sharp-

est.

3)  Attach the flange back gauge (43.50 mm) securely to the A-mount attachment and hold them together.
4)  Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50 mm) is the sharpest.

Turn the knob in the direction of the arrow of Fig. 4-3-2 for correct reading.

 

Focusing knob

Focus on fine lines on the surface.

Always turn the knob in the arrow
direction for correct reading.

5)  Turn the scale ring of the dial gauge until the long pointer indicates  0 .

This position is the flange back (f F) = 43.50 mm.

 

Memorize the position of short-pointer.

1)  Attach the checking lens to the flange back tester, and set the 1000 mm collimator.

 

1000 mm collimator

Checking lens

2)  Set the focus ring of the checking lens to 

∞

 (infinity) index or near 

∞

 (infinity)  and adjust the optical axis, observing the microscope 

so that the chart can be seen in the center.

3)  Turn the focusing knob of the flange back tester until the chart image comes into focus.
 

Also check the optical axis aligns with the chart center. (Refer to Fig. 4-3-4.)
Note: 

Figure shows example. The cause depends on individual lens.

 

Optical Alignment
Best alignment

Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.

4-5

SAL1635Z2 (Vario-Sonnar 2.8/16-35 ZA SSM II) (Vario-Sonnar T* 16-35mm F2.8 ZA SSM II)

4)  Check that the specification of the satisfied.

CB

Phenomenon that seems that color (flared) remains in one direction of ring chart at the best focus.

AS

Phenomenon that seems that color of ring chart divides into direction of cross at the best focus.

 

CB

AS

5)  If the specifications of CB and AS are not satisfied, perform the  Optical Axis Adjustment .

(mm)

TELE

CB

0.08

6)  When their values meet the specification, perform  4-5. FOCUS-SHIFT/FLANGE BACK (f F) CHECK/ADJUSTMENT .

1. Preparations
1

）

 Perform  4-3-2. Optical Axis Check  and confirm that the optical axis of checking lens does not meet the specification.

2. Procedure
1)  Remove the focus rubber ring.
2)  Loosen two screws fixing the decentering roller.

  If three pieces of decentering roller (no decentering) are used, replace them with two pieces of decentering roller.

 

DECENTERING ROLLER
(DECENTERING)

DECENTERING ROLLER
(NO DECENTERING)

Hole of Decentering Roller

Focus Rubber Ring

Part No.

Description

3-288-756-01

Decentering roller

3-298-351-01

Decentering roller (no decentering)

3)  Set the zoom to the TELE end.
4)  Rotate the focus ring to over-infinity side and by turning further from the infinity end set it at the position where the decentering roller 

(decentering, no decentering) can be seen through the hole for decentering roller.

5)  Adjust by rotating two pieces of decentering roller so that CB is eliminated.

6)  After adjustment, tighten two screws to fix the decentering rollers.
7) After finishing 4-3-3. Optical Axis Adjustment  and  4-5-2. Focus-shift/Flange Back (f F) Adjustment , apply the adhesive bond (B-

50) to the 2nd block (Decentering, no centering) roller and 2nd block lens holder. 

8) Perform 4-3-2. Optical Axis Check . If the optical axis does not meet the specification, perform repeatedly steps 2) to 6).
9)  In case that the value satisfies the specification, perform  4-4. PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT .

Perform after completing the focus-shift check/adjustment.

Equipment
•  1000 mm Collimator
•  Flange Back Tester
• A-mount Attachment
•  Flange Back Gauge (43.50 mm)
•  Resolving Power ADJ JIG
•  Adhesive bond (B-50)
•  L-shaped hex. wrench (0.89 mm)

Setting of Lens Test Projector.

Equipment
•  Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)

Connect the variable transformer (Output voltage: AC 100 V) to the lens test projector.

• A-mount Attachment
•  Screen (Art paper)
• Tape Measure
•  Plane Mirror (For SLRs)

1. Preparations
1)  Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal 

length.
(1)  Open the lid of the lens test projector.
(2)  Pull up and turn the fixed levers on the right and left sides of the lens test projector.
(3)  Remove or insert the lens.

Be sure to have the right position and direction of the lens.  

 

Lens test projector

Incorporate of the lenses
according to the checking focal-length (f).

Lens

Fixed lever

Fixed lever

Lid

f=18 to 35 mm

f=35 to 100 mm

f=100 to 200 mm

f=200 to 300 mm

Heat-absorbing filter 

Chart

Chart

Chart

Chart

Filament

Filament

Filament

Filament

4-6

SAL1635Z2 (Vario-Sonnar 2.8/16-35 ZA SSM II) (Vario-Sonnar T* 16-35mm F2.8 ZA SSM II)

2)  Attach the checking lens to the lens test projector, and set the equipment as shown in Fig. 4-4-2.
3)  Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.  

 

Distance

Lens test projector

Chart

Fan switch

Lamp switch

Plane mirror

Screen

A-mount attachment

Checking lens

F

L

4)  Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y  = 0).
5)  Set the plane mirror to the center of the projected image (y  = 0), and adjust the projector position so that the mirror reflects the light to 

the center of the lens.

2.  Projective Resolving Power Checking Method
1)  Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y  = 0).
2)  Read the number of the smallest pitched lines at the center (y  = 0).

 

The number represents for lines per mm.

Sagittal (S)

Meridional (M)

3)  Rotate the mount rotational plate of the lens projector while observing y  = 9, y  = 12, y  = 15 or y  = 18 and stop it at the location where 

the projective resolving power is worst (low).

 

Read the number of the smallest pitched lines (both sagittal and meridional: 3 lines) at the peripheral point.
Note: 

When reading the number of the smallest pitched lines, be careful of the spurious resolution.

Spurious resolution is the reversed image of 2 or 4 lines which appears on screen when focus is beyond maximum revolving power as shown 
in Fig. 4-4-4.

 

 

Do not confuse spurious resolution for the smallest pitched lines.

 

Correct resolution

Spurious resolution

4)  Change the focal length and projected length of the checking lens. (In case of the zoom lens), project the S image and the M image at 

each focal point/projected length and confirm that the number of resolution satisfies the specification of the Table 4-4-1.

Focal length 

f (mm)

Distance (m)

Center 
(y' = 0)

Number of the smallest pitched lines/mm

Peripheral (y' = 15)  

 Peripheral (y' = 18)

S

M

S

M

16

0.96

125 lines 

and more

40 lines and more

40 lines and more

40 lines and more    32 lines and more

24

1.33

25 lines and more

32 lines and more    25 lines and more

35

1.84

32 lines and more    25 lines and more

 32 lines and more

5)  Check the projective resolving power. If the projective resolving power does not meet the specification, perform  4-4-2. Projective Re-

solving Power Adjustment .

Check the projective resolving power. If the projective resolving power does not meet the specification, perform the projective resolving 
power adjustment.

1.  Projective Resolving Power (Partial Blur: WIDE) Adjustment
1)  Remove the rear light shield barrel in the finished state.
2)  Loosen a little bit screws fixing the 5th lens block assy.
3)  Check the projective resolving power at the WIDE end (16 mm).
4)  Adjust by shifting the 5th lens block assy so that the projective resolving power meets the specification.

  Move the 5th lens block assy in the direction to which the projective resolving power becomes the front focus tendency so that the partial blur 

is improved.

5)  After adjustment, tighten screws to fix the 5th lens block assy.
 

When the partial blur is not improved, perform  4.Projective resolving power (partial blur) adjustment (adjustment by partial blur ad-
justment washer) .

Rear Light Shield Barrel

Six Screws

4-7

SAL1635Z2 (Vario-Sonnar 2.8/16-35 ZA SSM II) (Vario-Sonnar T* 16-35mm F2.8 ZA SSM II)

Adjust this lens so that the center of maximum projective resolving power comes 5 cm before with respect to the focal point of the periph-
eral at the WIDE end.
Check the projective resolving power. Check whether the center of the projective resolving power locates forward or backward with re-
spect to the focal point of the peripheral.

1)  Disassemble the lens to the extent shown in Fig.4-4-6 (Optics Block Assy) and install the resolving power ADJ JIG, rear outer block 

assy, back adjustment washers (all of the inserted ones) and mount block assy.

2)  Adjust the focus at the WIDE end (16 mm) so that the maximum projective resolving power of the lens center comes 10cm before the 

focal plane of the lens peripheral.

  Adjust the focus using the lever bundled with the resolving power ADJ JIG.

 

Do not change the focus point until the adjustment in step 8) is completed. (Fix tentatively the lever with a tape.)

 

Place other screen chip (art post paper) at 10cm before the focal plane of the lens center so that the adjustment can be efficiently performed.

3)  Confirm the location where the peripheral locates with respect to the center in the maximum projective resolving power.
 

(How far it is isolated from the plane of projection and whether it locates in front or back of the plane of projection)

  Place other screen chip (art post paper) at the focal plane of lens peripheral and move it back and forth so that the confirmation can be efficiently 

performed.

4)  Loosen the screws fixing 4th lens block assy with L-Shaped Hex. wrench (0.89 mm).

 

Mount Block Assy

Rear Outer 
Block Assy

Resolving Power ADJ JIG
(J-6082-705-A)

(Lever)
* Insert it into the U-shaped groove 
  of the focus lens holder.

Optics Block Assy

L-Shaped Hex.  Wrench
(0.89 mm)

Back adjustment washers 
(all of the inserted ones)

5)  Adjust by rotating the 4th lens block assy as follows.
 

Tighten the 4th lens block assy (forward): The peripheral moves backward with respect to the center.

 

Loosen the 4th lens block assy (backward): The peripheral moves forward with respect to the center.

 

* Target: The plane of projection moves 3 cm when rotating the 4th lens block assy by 1/4th turns.

 

* Reference location: Location where the 4th lens block assy is loosened by rotating by one turn after tightened once.

6)  Fix the 4th lens block assy by tightening the screws loosened in step 4).
7)  Confirm the focus points of center and peripheral in the projective resolving power.
8)  Adjust by repeating steps 4) to 7) so that the maximum projective resolving power of the lens center comes 5 cm before that of lens pe-

ripheral.

 

4th Lens Block Assy

Tighten

Loosen

3.  Projective Resolving Power (Partial Blur: TELE) Adjustment
1)  Remove the front lens barrel block assy in the finished state.
2)  Remove the 1st guide pin and the adhesive bond.
3)  Install the 1st guide pins and tighten them.
4)  Loosen a little bit the G1 holding washer fixing the 1st front lens barrel block assy.
5)  Check the projective resolving power at the TELE end (35 mm).
6)  Adjust by shifting the 1st front lens barrel assy so that the projective resolving power satisfies the specification.
Note:

  Move the 1st front lens barrel assy in the direction to which the projective resolving power becomes the front focus tendency so that the partial 

blur is improved.

7)  After adjustment, tighten the G1 holding washer to fix the 1st front lens barrel assy.
8)  Apply the adhesive bond (B-50) to the gap (ring-like portion) between the 1st guide pin and the 1st lens holder.
9)  Apply the adhesive bond (B-50) to the oblong hole of 1st lens holder.

Apply the adhesive bond (B-50)

Universal wrench
J-6082-609-A

Front Lens Barrel Block Assy

G1 Holding Washer

Front Decoration Ring

Chip-A for
universal wrench:
J-6082-609-1

1st Guide Pin

Oblong Hole

1st Lens Holder

1st Guide Pin

10) In case that the projective resolving power (Partial Blur: WIDE) (Curvature of Field: WIDE) adjustment is performed, check the pro-

jective resolving power again.

 

In case that the projective resolving power (Partial Blur: TELE) adjustment is performed, perform  4-5-2. Focus-shift/Flange Back 
(f F) Adjustment .

 

When the partial blur is not improved, perform  4.Projective resolving power (partial blur) adjustment (adjustment by partial blur ad-
justment washer) .