Not For Resale – Free Download at http://www.joe-chan.com/manuals
L Taking Pictures by Flash
Even though the Canon EF can take pictures by candlelight, there are certain situations which require using an external light source. In dim light, when you want to stop fast action or take crystal clear snapshots full of vivid colors and fine details, you need flash. If you want to avoid harsh shadows when shooting in bright sunlight, flash can be used as fill-in light. At night, a nearby subject can be illuminated with flash. Since the Canon EF uses a vertically moving metal focal plane shutter, synchronization with electronic flash is possible at all speeds up to and including 1/125 sec. With a flash hot shoe built into the top of the pentaprism, the EF can easily accept any direct mounting electronic flash unit, including the specially-designed Canon Speedlite 133D. This flash unit (with the Flash-Auto Ring A2 or 62 attached to the front bayonet of the lens) employs the Canon Auto Tuning (CAT) System to determine the proper exposure in flash photography. The focused distance of the lens and the charging level of the 133D are sent as electrical signals to the camera's Variable Aperture AE control, which then adjusts the diaphragm automatically to produce
| Synchronization | CAT System Contacts |
| Contact |
| |
Left: Canon FD 35mm f/2 S.S.C., B at f/16, ASA 400.
Right: Canon FD 100—200mm f/5.6 S.C., Double Exposure, each shot at 1/30 sec., AE ASA 400.
39
