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4-14
SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)
4-4-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
Adjusting Method
1)
Perform “4-4-1. Flange Back (f’F) Check”, and check that the checking lens is out of specification.
2)
Set the focus of checking lens to over infinity end.
3)
Turn the focusing knob of the flange back tester until the chart image is the sharpest, confirm the flange back value. (a: Reading
value)
Flange back (f'F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
4)
According to the result in step 3), calculate amount of increase and decrease of the back adjustment washer using the following
formula. (X: Amount of increase and decrease of the back adjustment washer)
X (Amount of increase and decrease of the back adjustment washer) = a (Flange back value (by over infinity end)) - 45.13 mm
Specification
Over infinity end: 45.10 to 45.13 mm
5)
Adjust the back adjustment washer thickness according to the result in step 4). (Refer to Table 4-4-1 and Fig.4-4-5.)
Note:
Use the micrometer gauge (or slide gauge) to measure the back adjustment washer and coupler adjustment washer thickness.
If X (Amount of increase and decrease of the back adjustment washer) is a negative value (-):
Decrease the thickness of back adjustment washer by the value X.
If X (Amount of increase and decrease of the back adjustment washer) is a positive value (+):
Increase the thickness of back adjustment washer by the value X.
6)
Calculate the coupler adjustment washer thickness using the following formula, and replace the adjustment washer. (Refer to Table 4-
4-1 and Fig.4-4-7.)
Coupler adjustment washer thickness = Back adjustment washer thickness - 0.05 mm
Table 4-4-1
Back adjustment washer
Parts No.
t (mm)
A
2-684-123-01
0.05
B
2-684-124-01
0.07
C
2-684-125-01
0.1
D
2-684-126-01
0.2
E
2-683-127-01
0.5
Coupler adjustment washer
Parts No.
t (mm)
A
2-684-057-01
0.05
B
2-684-058-01
0.07
C
2-684-059-01
0.1
D
2-684-060-01
0.2
E
2-684-061-01
0.5
Ver. 1.3 2008.01
The changed portions from
Ver. 1.2 are shown in blue.
Ver. 1.2 are shown in blue.
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