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2-3

SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)

1

 SW Flexible and  Main Flexible Block

2

 Focus Rubber Ring

3

 MF Operation Ring

4

 Torque Ring Block

!-

 Torque Ring

!=

 

 Torque Ring

8

 Spring Lever

5

 Anti Slip Spring

6

 Fixed Holding

     Tube Block

7

 

Focus 

Operation

Ring Guide Nut

Block

9

 Pinch Distance

Adjust
Washer-A

0

 Float Ring

Holder

Spring Adjust

![

 Friction

      Spring

Select the friction spring and torque ring spring adjust
according to the rotation load of the torque ring as follows.

1. Use the friction spring B and torque ring spring adjust washer (1 piece) as reference.
2. Adjust the torque of the torque ring by changing the number of the 

3. If the rotation remains light even adjust the torque by torque ring spring adjust washer, 

Friction spring A (T = 2.05 mm): 2-684-266-01
Friction spring B

 (T = 1.32 mm): 2-684-267-01

Replace the friction spring B to the friction spring A and adjust again.

torque ring spring adjust washer (0 to 6 pieces).

(See Page 2-4.) 

(See Page 2-5.) 

Note: 

2-4

SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)

1

 Focus Range Switch Knob

2

 Limiter Stopper Plate Block

3

 FH Button Base

5

 SW Flexible

4

 Click Plate

Note: 
Select the gap adjust washer according to the rotation load of the focus
range switch knob as follows.

1. Install the gap adjust washer-B and check the rotation.
2. If the rotation is heavy, replace with the gap adjust washer-A.

3. If the rotation remains heavy even with the gap adjust washer-A,

Washer-A (T = 0.05 mm): 2-684-218-01
Washer-B

 (T = 0.1 mm):  2-684-219-01

Washer-C

 (T = 0.2 mm):  2-684-220-01

remove the washer and attach the focus range switch knob.

If it is largely wobbly, replace with the gap adjust washer-C.

2-5

SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)

(See Page 2-6.) 

1

 Gear Cover

8

 Fixed Barrel Unit

3

 Linear Guide Key

2

 Gear Block

6

 Focus Guide

7

 Focus

4

 Guide Pin

5

 Middle Tube Block

Stopper

9

 Main Flexible Block

2-6

SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)

(See Page 2-7.) 

1

 

Large 3 Group Lens Block

3

 Guide Pin

5

 Focus Cam Ring

4

 Iris (Inner) Tube Block

2

 

Large 2 Group Lens Block

6

 Aperture Operating Ring Holding

7

 Retainer and Steel Ball

8

 Iris Joint Ring Riveting Block

Note: 

Do not remove the aperture
operating ring holding, retainer,
steel ball and iris joint ring riveting
block as possible.

The changed portions from
Ver. 1.3 are shown in blue