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4-21

SAL35F14G (1.4/35G) (35mm F1.4G)

• 1000 mm Collimator

• Flange Back Tester

• A-mount Attachment

• Flange Back Gauge (43.50mm)

1)

Set the equipments as shown in the Fig.4-4-1.

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 sharpest.

3)

Attach the flange back gauge (43.50mm) 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 (43.50mm) is the sharpest.

Turn the knob in the direction of the arrow of Fig.4-4-2 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.

flange back gauge (43.50mm)

A-mount attachment

Objective lens (10x)

Dial Gauge (Min. scale: 0.01 mm)

Scale ring

Eyepiece lens (7x)

Eyepiece ring

Focusing knob

Focus on fine lines on the surface.

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

4-22

SAL35F14G (1.4/35G) (35mm F1.4G)

1000 mm collimator

Checking lens

1)

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

2)

Set the focus ring of the checking lens to infinity end position while looking through the microscope, and align the optical axis to the

center of the chart image accurately.

3)

Turn the focusing knob of the tester until the chart image is the sharpest (red and green color areas are equal on the chart *).

*: Position in which the color of collimator chart changes from green into red and come into focus.

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

Figure shows example. The cause depends on individual lens.

1)

Turn the G10, or do the adjustment of looseness. After align the axis.

2)

Apply the adhesive bond (B-10) to the G10 retainer.

Tolerance: 0.02 mm or less

1)

Calculate the flange back (f’F) of the checking lens using the following formula, and check that the specification of the Table 4-4-1 is

satisfied.

Flange back (f’F) of the checking lens = (SR flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)

35

44.58 to 44.62

2)

When the flange back (f’F) of the checking lens is out of specification of the Table 4-4-1, perform “4-4-2. Flange Back (f’F)

Adjustment”.

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.

4-23

SAL35F14G (1.4/35G) (35mm F1.4G)

• 1000 mm Collimator

• Flange Back Tester

• A-mount Attachment

• Flange Back Gauge (43.50mm)

• Adhesive bond (B-10)

1)

Perform “4-4-1. Confirmation of flange-back (f’F)” and confirm that the flange-back value (f’F) of lens does not meet the specifica-

tion in Table 4-4-1.

2)

Adjust the lens focus to the infinite.

3)

Observing the microscope, adjust the focus by turning the knob of flange-back measuring equipment.

4)

Calculate the shift amount by formula below.

Shift Amount (x) = f’F (measured value) at infinite - 44.60mm

x: Shift amount to be adjusted by backwasher

5)

Depending on the result in step 4), adjust the thickness of backwasher. (Refer to Table 4-4-2.)

Measure the thickness of backwasher with micrometer or calipers.

• When the shift amount (x) is the positive (+) value: Increase the thickness of backwasher by a value of x.

• When the shift amount (x) is the negative (-) value: Decrease the thickness of backwasher by a value of x.

6)

Build in the backwasher and perform “4-4-1. Confirmation of flange-back (f’F)” again.

35

44.58 to 44.62

7)

When the flange back (f’F) is out of specification of the Table 4-4-2, repeat steps 2) to 6) again.

Part No.

Description

2-684-123-01 BACK ADJUSTMENT WASHER A (t=0.05mm)
2-684-124-01 BACK ADJUSTMENT WASHER B (t=0.07mm)
2-684-125-01 BACK ADJUSTMENT WASHER C (t=0.1mm)
2-684-126-01 BACK ADJUSTMENT WASHER D (t=0.2mm)
2-684-127-01 BACK ADJUSTMENT WASHER E (t=0.5mm)

4-24

SAL35F14G (1.4/35G) (35mm F1.4G)

This section describes the check/adjustment of focus-shift amount resulting change of focal-length by aperture setting.

• 1000 mm Collimator

• Flange Back Tester

• A-mount Attachment

• Flange Back Gauge (43.50mm)

• Aberration measuring cap 55mm (SAL35F14G)

1)

Perform “1. Preparations” of “4-4-1. Flange Back (f’F) Check”.

2)

Set the checking lens focus to the infinite.

1)

Set the lens aperture to the open aperture position, and measure the flange back (f’F).

2)

Set the aberration measuring cap 55mm on the tip of lens as shown in the Fig.4-5-1, then measure the flange back (f’F).

3)

Calculate amount of focus-shift using the following formula, and check that the specification is satisfied.

The focus-shift amount of the checking lens is difference between the flange back (f’F) of open aperture and flange back

(f’F) reading (using aberration measuring cap 55mm).

Focus-shift = Flange back (f’F) reading (using aberration measuring cap 55mm) - flange back (f’F) of open aperture reading

Focus-shift (mm) = +0.05 to +0.20

4)

Perform the “4-9. WRITE dSB”.

Aberration measuring cap 55mm (SAL35F14G)