Focus-Shift Check/Adjustment (Aperture (Amount Of Spherical Aberration)) - Sony SAL1855 Service Manual

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4-5.

FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF SPHERICAL

ABERRATION))

In this section, the check/adjustment of focus-shift, which arises from the change of aperture, is described.

Equipment (Only the specific equipment is listed.)

• Aberration Measuring Cap 55mm (SAL1855)

4-5-1. Focus-shift (Aperture (Amount of spherical aberration)) Check

1. Preparations

Perform "LENS GENERAL ADJUSTMENT GUIDE 5. FOCUS-SHIFT CHECK (APERTURE (AMOUNT OF SPHERICAL

ABERRATION))".

2. Confirmation

Set the zoom to the TELE end (55mm) and the focus to infinity and over.

Check the focus-shift (amount of spherieal aberration) and confirm that the focus-shift satisfies the specification below.

Specification: -0.10 to +0.14

According to the result in procedure 2), perform "4-6-5.

SAL1855 (DT 3.5-5.6/18-55 SAM) (DT 18-55mm F3.5-5.6 SAM)

SB Check/ Write

SB", using the lens adjustment program.

4-9

4-1-2. Adjustment Flow Chart

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