Sony E 10-18 mm f/ 4 OSS Lens Guida Utente

4-17

SAL75300 (4.5-5.6/75-300) (75-300mm F4.5-5.6)

• 1000 mm Collimator

• Flange Back Tester

• A-mount Attachment

• Flange Back Gauge (43.50mm)

• Universal Wrench

• Chip-A for Universal Wrench

• Chip-B for Universal Wrench

1)

Measure the flange back at focal length 300 mm (f’t) and 75 mm (f’w) referring to “4-5-1. Focus-shift Check”.

2)

Calculate amount of focus-shift (T) using the following formula.

T:

Amount of focus-shift that should be adjusted by the adjusting washer thickness.

f’t: Flange back value (mm) at focal length (300 mm)

f’w: Flange back value (mm) at focal length (75 mm)

T = (f’t - f’w)/5.28

3)

Adjust the adjusting washer thickness according to the result of step 2). (Refer to Table 4-5-1 and Fig.4-5-1.)

When the focus-shift (T) is a positive value: Increase adjusting washer thickness by the amount of T.

When the focus-shift (T) is a negative value: Decrease adjusting washer thickness by the amount of T.

A

2-698-471-01

0.05

B

2-698-472-01

0.06

C

2-698-473-01

0.07

D

2-698-474-01

0.1

E

2-698-475-01

0.2

F

2-698-476-01

0.5

4)

Perform “4-5-1. Focus-shift Check” again, and repeat steps 1) to 3) until the focus-shift amount is within the specification range.

Adjusting Washer