(2) Faster speed
Besides the smaller size, the stronger drive spring affords a maximum
shutter speed of 1/8000 sec. and X-sync at 1/250 sec. (curtain speed: 2.4
ms/15 mm).
Note: For non-EOS external flash, check whether it can sync at 1/250 sec.
(3) Better control
To control fast shutter speeds, a stronger magnet is used. The shutter
control is thereby better.
Electrical X contacts are used for the sync contacts. Through the electrical
X contacts (semiconductor switch), the mechanical X contacts are switched
ON/OFF by a low voltage. Therefore, there is no contact scorching or
frictional wear. The contacts are thus highly reliable. The PC terminal has no
polarity.
Also, the battery life during bulb exposures is about 2.5 hours with a fully-
charged BP-511A.
4) ISO speed
(1) ISO speed range
ISO 100 - 1600 can be set in 1-stop increments. When C.Fn-08-1 (ISO
speed extension) is set, an ISO speed equivalent of ISO 3200 (H) can be set.
(2) ISO auto
The ISO auto feature that sets the ISO speed automatically in Basic Zone
modes was first incorporated in the EOS 10D. However, due to user
suggestions, this feature has been revamped.
As shown in Table 008, ISO 400 (except in Portrait mode) is the basic ISO
speed. This results in good image quality while reducing the chances of
camera shake more than before. When flash is used, the main subject's
background will also look bright.
Technical Information
18
Table 007 Shutter Design Specifications
Item
Specification
2. Shutter curtain type
Parallelogram link type
4. Shutter curtain material
1st curtain: 4 blades made of KN Mylar
2nd curtain: 4 blades made of KN Mylar
5. Drive system
1st curtain: Dedicated torsion spring
2nd curtain: Dedicated torsion spring
6. Speed control method
All speeds electronically controlled with the electrical
conduction interval of the 1st curtain's dedicated magnet and
the 2nd curtain's dedi-cated magnet. (The magnet attracts the
curtain when turned on, and releases when turned off.)
7. Curtain speed
Approx. 2.4 ms/15 mm
10. Signals
1. X-sync (electronic X), 2. 2nd curtain travel-completed signal
1/250 sec.
9. Max. flash sync
1/8000 sec. - 30 sec., bulb
8. Shutter speed range
Vertical-travel, focal-plane shutter
1. Type
1st curtain: 4 blades 2nd curtain: 4 blades, total 8
3. Shutter curtain blades
Summary of Contents for EOS 20D Digital
Page 1: ...e ...
Page 2: ...EOS 20D SERVICE MANUAL Copyright 2004 Canon Inc ...
Page 116: ... MEMO Repair Information 9 ...
Page 140: ...Repair Information 33 MEMO ...
Page 141: ...2 9 Top Cover Ass y Disassembly Repair Information 34 Fig 111 3 1 1 1 1 1 3 4 2 ...
Page 155: ...Copyright 2004 Canon Inc Parts Catalog ...
Page 156: ......
Page 157: ...PARTS CATALOG EOS 20D REF No C12 6061 ...
Page 184: ... CANON INC 2004 2 BLOCK DIAGRAM 2 1 GENERAL REF NO C12 6061 01 SEP 2004 ...
Page 185: ... CANON INC 2004 2 2 POWER SUPPLY REF NO C12 6061 01 SEPT 2004 ...
Page 224: ...SI CHART FOR 20D ...
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