Canon VI-T User Manual
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The shutter can be adjusted to speeds of 1 second, and 1/2, 1/4, 1/8, 1/15, 1/30,
1/60, 1/125, 1/250, 1/500, and 1/1000 of a second as well as B(bulb) and X exposures.
Each exposure time is half that of the previous one. This method of adjusting
is convenient when calculating the relevant lens aperture.
In adjusting the shutter speed, turn the shutter dial either to the right or left
until the desired reading is obtained. With the scale set at B (bulb), the shutter
will open, and stay open, until you release pressure from the shutter button. It
is used, therefore, for exposure times in excess of one second. The X scale
reading is used for speedlight (electroflash) synchronization. The shutter speed is
approximately l/50th of a second; however, the effective time of the exposure in
this case becomes faster depending on the performance of the flash light. When
time exposure is required, set the dial to B and use a cable release with lock.