Sony SAL300F28G Service Manual ▷ View online
5-17
SAL300F28G (2.8/300 G) (300mm F2.8 G)
5-2-2. Aperture Diameter Adjustment
Equipment
• Small pattern box PTB-1450
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC)
(Color Calculator 2 installed)
• Adhesive bond (B-10)
• Maximum Apertuer JIG
1. Preparation
1)
Disassemble or assemble the checking lens into the state of Fig.5-2-8.
(Remove the parts of forward (object side) from the aperture blade, perform in the condition the lens is seen.)
2)
Install the maximum aperture jig and open the aperture.
Fig.5-2-8
5-18
SAL300F28G (2.8/300 G) (300mm F2.8 G)
2. Adjustment Procedure
1)
Loosen the three screws that tighten the aperture hold ring, open the aperture and rotate the operation hold ring. then, adjust so that
the aperture blades are hidden behind the aperture hold ring.
2)
Tighten the three screws, apply the adhesive bond (B-10).
Fig.5-2-9
3)
Assemble the lens completely, perform “5-2-1. Aperture Diameter Check”.
Note:
Perform “5-2-2. Aperture Diameter Adjustment” and “5-2-1. Aperture Diameter Check” until the aperture tolerance meets
the specification.
Aperture Blade(9 pieces)
Connect Barrel
Aperture Operate Plate
Apply the adhesive
bond (B-10)
bond (B-10)
Apply the adhesive bond (B-10)
Apply the adhesive bond (B-10)
Apply the adhesive
bond (B-10)
bond (B-10)
5-19
SAL300F28G (2.8/300 G) (300mm F2.8 G)
5-3.
PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
Equipment
• Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
Note:
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
Note:
Note:
Check the projective resolving power of the checking lens at the following focal-length and distance.
Focal-length f (mm)
distance (m)
300
12.08
Table 5-3-1
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.
Note:
Be sure to have the right position and direction of the lens.
Fig.5-3-1
Lens test projector
Incorporate of the lenses
according to the checking focal-length (f).
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
5-20
SAL300F28G (2.8/300 G) (300mm F2.8 G)
2)
Attach the checking lens to the lens test projector, and set the equipments as shown in Fig.5-3-2.
3)
Turn the fan switch of the lens test projector to ON, then turn the lamp switch to ON.
Fig.5-3-2
4)
Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y’=0).
5)
Set the plane mirror to the center of the projected image (y’= 0), and adjust the projector position so that the mirror reflects the light
to the center of the lens.
Distance
Lens test projector
Chart
Fan switch
Lamp switch
Plane mirror
Screen
A-mount attachment
Checking lens
F
L
Click on the first or last page to see other SAL300F28G service manuals if exist.