Canon EOS 7 Service Manual page 144

Part 3: Repair Information
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REPARATION
1. Insert a 2mm reinforcement ring between the dial gauge's prong and contact
element.
(This is necessary because the dial gauge is designed for a flange focal distance of
42.14 mm.)
2. Use the flange focal distance gauge (44.14mm or 42.14mm) and the optical flat, and
set the dial gauge to 0.
Dial gauge
Reinforcement
ring
Contact
element
• Check that the inner scale on the dial
gauge is as shown below. Then set
the gauge to 0 on the outer scale.
0
1 9
2 8
3 7
4 5 6
44.14mm-Gage
0
9
1
2 8
3 7
4 5 6
42.14mm-Gage
Fig. 3-54 Dial gauge
3-40
Flange focal
distance gauge
Optical flat