Canon EOS 7 Service Manual page 78

(2) Exposure control
1) Automatic exposure control
In addition to all the
picture-taking modes that
the EOS ELAN II E / EOS 50
E has, the EOS ELAN 7 E /
EOS 30 also has the Night
Scene mode.
2) Shutter
The shutter unit is based on
the EOS ELAN II E / EOS 50
E's shutter unit. Table 2-4
shows the shutter's design
specifications.
Item
1. Type Vertical-travel, focal-plane shutter
2. Shutter Blade Type Parallel, four-sided link type
3. Shutter Blades 8 blades (four each for the 1st and 2nd curtains)
4. Shutter Blade Material Metallic and engineering plastic
5. Driving System 1st and 2nd curtains each driven by a
torsion spring
Electromagnetic holding dedicated to
6. Shutter Speed Control
each of the 1st and 2nd curtains. All
speeds electronically controlled by
the electromagnet which releases the
curtain while the power is off.
7. Curtain Speed Approx. 4.8 ms/24mm
8. Shutter Speeds 30 sec. – 1/4000 sec., bulb
9. Max. Sync Speed 1/125 sec.
10. Signal X-sync, 2nd curtain travel-completed signal
Table 2-4 Shutter Design Specifications
2-11
Part 2: Technical Information
Specification