Canon Speedlite 177A Instructions

Short Description
The Canon Speedlite 177A is an automatic eletronic, direct contact flash designed especially for the Canon A-1, AE-1, AV-1 and AT-1 single-lengs reflex cameras. It mounts directly into the accessory shoe of the camera where it coouples directly with the camera without the need for a synchronization cord.

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Content
On the A-1 and AE-1, the 177A permits AE flash, which is without doubt one of the easiest forms of flash shooting in SLR photography. As soon as the pilot lamp lights, the shutter speed of these cameras is automatically set to the X-synchronization speed of 1/60 sec, and the aperture is set on the camera automatically to the same aperture which has been set with a switch on the flash. On the AV-1 and AT-1, the shutter speed is also automatically set while setting the aperture is a simple matter of turning the lens’ aperture ring to the same aperture set on the flash. The A-1, AE-1 or AV-1 itself remains right on automatic. With any of these A-series cameras, the Canon Power Winder A couples with the Speedlite 177A for increased versatility. The 177A’s uniqe averaged light sensing system regulates the sensitivity distribution of the unit’s sensor for the best possible overall exposure.
An extra special feature of this flash is AE automatic switch which is possible on the A-1, AE-1, or AV-1 when they are on automatic. While the pilot lamp is out after a flash shot, one of these cameras automatically returns to normal AE photography. Provided the aperture and shutter speed are proper for correct exposure, it is possible to switch continously between flash photography and normal AE photography as the pilot lamp comes on and goes out.
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