Canon C12-8453, Service Manual

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3.4 V
IEWFINDER
F
OCUSING
A
DJUSTMENT
<P
URPOSE
>
To match the film plane’s focusing position and the viewfinder’s focusing position.
<S
TANDARD
>
As shown in the figure below, the focusing must be within 1.5 lines to the left or right
of the index mark at infinity.
Fig. 3-56 Lens focusing distance window
<T
OOLS
>
• Magnifier AD-S
• EF 50mm f/1.8 (production lens)
• General-purpose 500mm collimator
<A
DJUSTMENT
>
1. Attach the magnifier to the camera’s eyepiece, and adjust the magnifier’s diopter.
(Do this without any lens attached to the camera.)
Dioptric adjustment
While looking at a bright, highly reflective wall (white wall at EV12 or a light source
from a shutter tester), turn the magnifier’s dioptric adjustment ring until the
focusing points look clear.
2. Attach an EF 50mm f/1.8 lens and set the focus to infinity manually.
(The center of the infinity symbol must be within the thickness of 1.5 lines of the
index.)
3. Look at an object (preferably a smokestack, antenna, etc.) at least 250 meters away.
Select the focusing washer that makes the object look the clearest.
4. If you use a collimator, select the focusing washer that makes the collimator’s scale
look the clearest.
Part 3: Repair Information
3-42
• Be sure to do this adjustment after adjusting the flange focal distance.
CAUTION
22 11 22 11
15
2.5
ft
8
5 m
∞
Center of
∞
mark
1.5 lines
Index