SAL50F14Z - Sony Digital Camera Service Manual (repair manual). Page 20

4-6

SAL50F14Z (Planar 1,4/50 ZA) (Planar T*50mm F1.4 ZA SSM)

4)  Perform Step (1) through Step (6) and ensure that the AS and CB values are within specifications. 

  If the specification is  CB  only, steps 1 to 3 are not required.

 AS 

(astigmatism)

 

The phenomenon where the flare on the ring chart appears in a cruciform shape with the ring chart in the sharpest focus. (Fig. 4-3-5 (a))

(1)  Turn the focusing knob until the flare becomes minimum between two approximately opposite points on the ring chart edge (as 

shown with the arrows in Fig. 4-3-5 (b)), and then read the dial gauge value. <A>

(2)  Turn the focusing knob until the flare becomes minimum between two points with the phase of the flare rotated by 90 degrees 

from the above condition (as shown with two arrows in Fig. 4-3-5 (c)), and then read the dial gauge value. <B>

(3)  Calculate the AS value (absolute difference between <A> and <B>) and ensure that it is within specifications.
 

AS value = <A> - <B>

 

CB (Center Blur)

 

The phenomenon where the flare on the ring chart trails in one direction with the ring chart in the sharpest focus. (Fig. 4-3-5 (d))

(4)  Turn the focusing knob until the ring chart edge in the direction of the maximum flare is in the sharpest focus (as shown with 

the arrow in Fig. 4-3-5 (e)), and then read the dial gauge value. <C>

(5)  Turn the focusing knob until the ring chart edge, opposite 180 degrees from the above condition (as shown with the arrow in Fig. 

4-3-5 (f)) is in focus, and then read the dial gauge value. <D>

(6)  Calculate the CB value (absolute difference between <C> and <D>) and ensure that it is within specifications.
 

CB value = <C> - <D>

 

(1)

(1)

(2)

(2)

(5)

(4)

AS

E

D

F

H

G

I

CB

CB (center blur)

Less than 0.05 mm

5)  If the specifications of CB and AS are not satisfied, perform the  4-3-2. Optical Axis Adjustment .
6)  When their values meet the specification, perform  4-4. PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT (ONE SIDE 

BLUR ADJUSTMENT) .

1. Preparations
1

）

 Perform  4-3-1. Optical Axis Check  and confirm that the optical axis of checking lens does not meet the specification.

2. Procedure
1)  Check the optical axis, if it does not satisfy the specification. Replace the 1st Group Lens Block Assy.

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