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4-9

SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)

2. Check Method 
1)   Set the zoom to the TELE end (300 mm), and then set the focus to the over infinity end .
2)   Adjust the focus by rotating the knob of flange back tester and in case that read the flange back value (Read value : f t).
3)   Set the flange back tester to  44.56  by rotating the near end.
4)   (In the state that the unit is set to the TELE end) Adjust the focus.
5)   Set the zoom to the WIDE end. Do not rotate the Focus Ring at this time.
6)   Read the flange back value (Read value : f t).
7)   Calculate the increment or decrement of the 1st group adjustment washer and the FB adjustment washer by the formula below. 

TB = (f t - f w  - 6.9) / 6.363

 

 

TB:  Increment or decrement of the 1st group adjustment washer

 

 

f t:  Flange back value at the TELE end (300 mm) and over infinity end

 

 

f w:  Flange back value at the WIDE end (55 mm) and over infinity end

 

•  When the TB value is positive (+), increase the thickness of the 1st group adjustment washer.
•  When the TB value is negative (-), decrease the thickness of the 1st group adjustment washer.

WB = f w - 44.56 - TB x 0.239

 

 

WB: Increment or decrement of FB adjustment washer

 

 

f w:  Flange back value at the WIDE end (55 mm) and over infinity end

 

 

TB:  Increment or decrement of 1st group adjustment washer

•   When the WB value is positive (+), increase the thickness of the FB adjustment washer.
•   When the WB value is negative (-), decrease the thickness of the FB adjustment washer.

8)   Increment or decrement the 1st group adjust washer and FB adjustment washer according to the result of step 7).
9)   Perform  4-5-1. Focus Shift (Focal Distance)/Flange Back (f F) Check .

 

Retainer

1st Group Assy

1st Group Adjustment Washer

Part Number

t (mm)

4-442-269-01

0.8

4-442-270-01

0.5

4-442-271-01

0.3

4-442-272-01

0.1

4-442-273-01

0.08

4-442-274-01

0.07

4-442-275-01

0.05

4-442-276-01

0.2

4-442-277-01

0.03

4-442-278-01

0.02

 

Screws

Screw

Rear Light Shield Barrel

Contact Board Assy

Screws

 

Mount Assy

FB Adjustment Washer

Screws

Screws

Part Number

t (mm)

4-299-327-01

0.5

4-299-327-11

0.3

4-299-327-21

0.2

4-299-327-31

0.1

4-299-327-41

0.05

4-299-327-51

0.03

4-299-327-61

0.02

10) Perform  4-5-1. Focus Shift (Focal Distance)/Flange Back (f F) Check .

4-10

SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)

Shoot images with the lens to be tested and the AE master lens under the following conditions (Note 1), and compare the images to check 
the error amount (Note 2).
Note 1:

 

・

Shooting magnification (60, 40, 20 times)

 

・

Chart for checking the depth area of image-formation (tilting chart 2 types)

 

・

Defocus value  0 

±

 10 

μ

m

The higher the magnification, the focusing error amount becomes the bigger. Therefore, it is easy to judge of result.

 

If the error amount is outside of the range, perform  4-8-4. Focusing Error Amount Adjustment (Write 

⊿

SB) .

•  Chart for checking the depth area of image-formation (40, 60 times)

Acquire the  Chart_for_checking_image_formation_40x_60x_(E).zip  from the each HQ.

•  Chart for checking the depth area of image-formation (20 times)

Acquire the  Chart_for_checking_image_formation_20x_(E).zip  from the each HQ.

• Software

Acquire the following either software from the each HQ.

Software

Camera

DSLR-A700 Defocus checker

DSLR-A700

Defocus Checker 2

SLT-A37/A57/A58/A65/A77/A99

 

•  Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• HASP key
•  Personal Computer (supporting Seus-EX)
•  AE Master Lens

J-6082-597-A: 50 mm/F1.7

• Illumination

J-6082-642-A: Fluorescent Lamp (specified color rendering)
J-6082-643-A: Fluorescent Light Stand (high-frequency lighting type)

• Memory Card
• Tripod

1. Preparation
1)  Insert the memory card to the camera.
2)  Set the camera and chart for checking the depth area of image-formation as shown in Table 4-6-2, Fig. 4-6-1 and Fig. 4-6-2.

Shooting distance is obtained by shooting magnification and focal length as following.

 

[Shooting distance] = [shooting magnification] 

×

 [focal length]

Select the combination according to the Table 4-6-2 Guidelines table.

  If the shooting distance using a 60 times chart cannot be ensured indoors, temporarily use a combination of 40 times chart or 20 times 

chart.

3)  Connect the camera and personal computer (when using HASP Key) with USB cable and activate Defocus Checker 2 or DSLR-A700 

Defocus checker.

 

In case Defocus Checker 2 is used, click [Connect] to set connection mode.
Note:

  If an abnormal phenomenon appears during installation of the teleconverter used by the user, install the user s teleconverter.

 

Selection of 
Shooting magni-
fication

AF Assist Chart (Size) 
Refer to Fig. 4-6-1.

Applicable Cam-
era (image sen-
sor type)

Applicable Lens

Calculation example of shooting 
distance 
[shooting magnification] 

×

 [fo-

cal length] = [shooting distance]

60 times 
(middle distance)

AF Assist Chart 60 Times 
(200 mm 

×

 100 mm)

APS-C size type 

All

60 times 

×

 50 mm = 3000 mm

40 times 
(middle distance)

AF Assist Chart 40 Times 
(132 mm 

×

 66 mm)

35 mm full size 
type

All

40 times 

×

 50 mm = 2000 mm

20 times 
(short distance)

AF Assist Chart 20 Times 
(66 mm 

×

 33 mm)

both size available

•  Macro lens
•  Lens with a focal 

length of more 
than 300 mm

20 times 

×

 300 mm = 6000 mm

 

(100 mm)

(66 mm)

(33 mm)

(200 mm)

(132 mm)

(66 mm)

AF Assist Chart
60 Times

AF Assist Chart
40 Times

AF Assist Chart
20 Times

 

Camera Setting

Exposure mode
Focus Mode
Focus Area

Image Size
Super SteadyShot
Drive Mode

: A (Open Aperture)
: MF
: Spot Focus Area
  (Fixed at the center)
: L
: OFF
: Self-timer

Shooting distance

Set the optical axis to the center 
of the AF assist chart.

AF Assist Chart
(60 Times/40 Times)

Chart for checking the depth area of image-formation
(60 Times/40 Times)

4-11

SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)

2. Shooting procedure
1)  Click the [Start] of Defocus Checker 2 or DSLR-A700 Defocus checker to start the measurements.
2)  Adjust defocus value to obtain  0 

μ

m  in the manual focus mode.

 

The tolerance is  0 

±

 10 

μ

m . (Fig. 4-6-3)

3)  Click the [Stop] of Defocus Checker 2 or DSLR-A700 Defocus checker.
4)  Shoot an image by self-timer.
5)  Perform the steps 1) to 4) by using the AE master lens and the lens to be tested.

Shoot images with the AE master lens and the lens to be tested using the same camera.

Perform entire work within 10 minutes because values become unstable as the camera temperature increases.

 

 

If the work continues for 10 minutes or longer, cool down the camera and then restart the work.

Since focusing error amount increases in shooting images at a middle or long distance, comprehensive focusing error amount cannot be 
determined correctly only by results with short-distance setting. If the shooting distance using a 60 times chart cannot be ensured indoors, 
take either of the following methods.

 

 

 

 

Use 35 mm full size type camera (SLT-A99) and 40 times chart. (When using the 40 times chart, shooting distance can shorten to 2/3 of 
60 times chart.)

 

 

 

 

Check the focusing error amount of short distance using 20 times chart temporarily. After that, shoot the something images outdoors in the 
middle distance for using 60 times chart, and then check the focusing amount of middle distance.

 

Defocus Checker 2
(For SLT-A37/A57/A58/A65/A77/A99)

DSLR-A700 Defocus checker
(For DSLR-A700)

In case Good (0 

± less than 10 μm), frame 

of waveform area displays in green.

In case Good (0 

± less than 10 μm), frame 

of waveform area and defocus value display 
in green.

3.  The focusing error amount check
1)  Open the images shot with the lens to be tested and the AE master lens by the image display software on the PC. (Display the images 

at the same pixel magnification.)

2)  Check the displacement between the focus position (peak of image-formation) of the lens to be tested and the focus position of the AE 

master lens. (Refer to Fig. 4-6-4 and Fig. 4-6-5.)

3)  Compare the error amount in step 2) with the reference value of Table 4-6-3 and check whether the error amount is within the accept-

able range. If the error amount is outside of the range, perform  4-8-4. Focusing Error Amount Adjustment (Write 

⊿

SB) .

Focal length/

55 - (100 mm)

Distance

(mm)

2.0 m (20 times)

0 

±

 30

4.0 m (40 times)

0 

±

 119

6.0 m (60 times)

0 

±

 267

Focal length/

200 mm

Distance

(mm)

4.0 m (20 times)

0 

±

 33

8.0 m (40 times)

0 

±

 132

12.0 m (60 times)

0 

±

 297

Focal length/

300 mm

Distance

(mm)

6.0 m (20 times)

0 

±

 37

12.0 m (40 times)

0 

±

 148

18.0 m (60 times)

0 

±

 333

4-12

SAL55300 (DT 4.5-5.6/55-300 SAM) (DT 55-300mm F4.5-5.6 SAM)

<For reference 1: shooting image by AE master lens> (Fig. 4-6-4)
•  Assume it standard image in the setting environment.
•  If the peak of image-formation is to equal distance with AF assist chart position, it is ideal. In actual fact, the image of before and 

behind the peak is displayed. (Because the environment, the individual difference of camera and lens conditions are combined.)

•  The image of before and behind the peak, assume it reference standard image.
•  When shooting the image with sharpness setting of the camera to  +  side, it is easy to distinguish the peak of imaging area remarkably.

Enlargement of same pixel magnification

Example of image shot with 
a certain AE master lens under 
a certain environment.

Identifying the peak position of 
image-formation:
• Center of sharpest area
• Center of area with less color fogged
    - Front defocus area: Magenta fogged
    - Rear defocus area: Green fogged

Example where peak position accidentally matches 
the AF Assist Chart position

 

<For reference 2: The example of focusing error amount value check> (Fig. 4-6-5)
Check the displacement between the focus position (peak of image-formation) of the lens to be tested and the focus position (peak of 
image-formation) of the AE master lens.

Example of image shot with lens to be tested (50 mm F1.4)

Example of image shot with AE master lens

Peak area
(existing around 7 to 8 cm
of the rear scale)

Peak area
(existing around 6 to 7 cm
of the front scale)

Error amount = approx. 14 cm

Example of decision:
The lens to be tested has a tendency of backward defocusing compared to the AE master lens. The error amount is approx. 14 cm.
Compare this error amount with the reference value and check whether the error amount is within the acceptable range.
If the error amount is outside the acceptable range, perform  4-8-4. Focusing Error Amount Adjustment (Write 

⊿

SB) .