Angenieux EZ1 S35 User Manual page 18

3.3.1 Flange/Back-focus adjustment
Although the mechanical flange is factory set for standard PL-mount at
52.00 mm in the air, the flange can be adjusted to fit more accurately to
the position of the sensor on the camera by modifying the thickness of the
flange shim.
The flange can be adjusted using a collimator or a projector.
When using a projector, proceed as follows:
- Mount the lens on a projector with a PL-mount tester
- Put the projector at a distance of about 1.8m from the screen
- Set the iris at full aperture
- Optimize the focus at long focal length.
- Then zoom to wide angle:
- If the best focus plan is between the screen and the lens, it is necessary
to decrease the thickness of the shim
- If the best focus plan is behind the screen, it is necessary to increase
the thickness of the shim.
To replace the flange shim : (see FIGURE 2)
- Unscrew the PL mount (1) and remove it (2)
- Unscrew the nut of the washers (3) with an adjustable wrench
- Remove the washer (4)
- Changing the thickness of the chock
- Place the chock (5) and fit the nut (6)
- Reassemble the PL mount (7) (8)
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3.3.2 Tracking adjustment
Tracking corresponds to the difference in pointing of the optical axis
between the short focal length and the long focal length.
This parameter can be evaluated in projection or on camera by pointing
a fixed object at the center of the image.
To evaluate the tracking, place it in short focal length and note the posi-
tion of the center of the image. Go to long focal length and note the diffe-
rence in position of the center of the image.
To adjust the tracking setting, perform the following actions: (see FI-
GURE 3 at the end of the manual.
- Unscrew the PL mount (1) and remove it (2)
- Remove the red ring using a Phillips screwdriver (3 screws) (3)
- Remove the retaining nut of the draft shim and the shim (4)
- Loosen without removing the 6 hexagonal screws 1.5mm placed
behind the shim (5)
- The tracking adjustment is made by playing on the 4 hexagonal screws
of 0.9 mm placed at the periphery of the lens (6)
- Reassemble the shim, and its holding nut (7)
- Reassemble the PL mount (8)
- Adjust tracking
- Disassemble the PL mount
- Remove the shims and tighten the 6 hexagonal screws 1.5mm
- Reassemble the shims and reinstall the red ring (9)
- Reassemble the PL mount (10) (11)