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4-3

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

Equipment
• Luminance Box
•  Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
•  AE Master Lens
• Memory Card
•  Personal Computer (Color Calculator 2 installed)

  Confirm the checking lens by complete.

1)  Install the memory card to the camera.
2)  Set the equipment, camera and AE master lens as shown in Fig. 4-2-1.

Luminance box
 Luminance: EV12

Camera
 ISO: 100
 Exposure Mode: M
 Shutter Speed: 1/125
 Aperture: F5.6
 Focus Mode: MF
 Metering: Center weighted
 Preset white balance: Tungsten
 D-R: OFF

Master lens or checking lens
Focus: Infinity end

Shoot the center of the luminance surface

3)  Shoot the images under the following conditions and save them.

Shoot the center of the luminance surface three times with the AE master lens and checking lens.

Luminance:

EV12

Focus:

Infinity end

ISO:

100

Exposure Mode:

M

Shutter Speed:

1/125

Aperture:

F5.6

Focus Mode:

MF

Metering:

Center weighted

Preset white balance:

Tungsten

D-R:

OFF

Check the image of both AE master lens and checking lens.

1)  Start the Color Calculator 2.

 

2)  Read the image from the file menu.

⇒

3)  Set the Color Calculator 2 as follows.
 

Measured value display (Display menu):  RGB+L*a*b*

 

Measuring method (Display menu): 

Center Single Area

 

 

Color space (Edit menu): sRGB

 

 

Area size for calculate (Edit menu 

→

Option): 256

×

256 Pixels

 

4-4

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

4)  Click the Calculate button to measure the image.
5)  After measuring, check the  G  values.
 Average 

G  value of the three images shoot with master lens: 

(a)

 Average 

G  value of the three images shoot with checking lens:  (b)

 

Calculate button

Check the “G” value

3. Checking Method
1)  Calculate aperture error using the following formula, and check that the aperture error is within the specification.

Aperture error = Average  G  value of checking lens (b) - Average  G  value of master lens (a) 

 

Aperture error = -20 to +5

2)  When the aperture error is out of specification, perform  4-2-2. Aperture Diameter Adjustment .

Equipment
• Universal Wrench
•  Chip-A for Universal Wrench
•  Adhesive bond (B-10)

Adjustment Procedure
1)  Disassemble or assemble the lens as shown in Fig. 4-2-8.

 

1st Group Lens Block Assy

Front Ring

2)  Remove the adhesive bond and loosen the screws fixing the aperture cam plate.

 

Remove the adhesive bond

Remove the adhesive bond

Remove the
adhesive bond

Remove the
adhesive bond

3)  Set the Aperture Preset Ring at the aperture open position by moving the preset lever, and fix the Aperture Preset Ring.

 

Preset lever

Aperture open position

4)  Move the Aperture Blade Unit of aperture in the position where the Aperture Blade Unit of aperture is completely hidden by the inside 

diameter of the aperture cam plate and tighten the screws of the aperture cam plate.

 

Aperture Blade Unit

Aperture cam plate

4-5

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

5)  Apply adhesive bond (B-10) to the screws shown in Fig. 4-2-12.

 

Apply adhesive 
bond (B-10)

Apply adhesive 
bond (B-10)

Apply adhesive 
bond (B-10)

Apply adhesive 
bond (B-10)

6)  Assemble the lens completely.
7) Perform the 4-2-1. Aperture Diameter Check  and repeat steps 1) to 4) until the aperture tolerance meets the specification.

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)

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 sharpest.
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.

4-6

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