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Flash synchronisation |
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The flash has to be synchronised with the shutter speed
used. That is the flash has to trigger/fire at the very momment when the
film/sensor is absolutely uncovered by the shutter.The minimum hand held
shutter speed for any camera worldwide is 1/60th of a sec. Some modern
cameras offer synchronisation shutter speeds upto 1/250th sec but do check
out the camera manual before setting it to a higher shutter speed than the
conventional 1/60th sec. If you are unsure, it is safe to be at 1/60th sec.
Shutter speeds lower than 1/60th sec can ofcourse be used where ever
apllicable. This is known as slow synchronisation with two
possibilities-front and rear curtain synchronisations. In the front curtain,
the flash fires synchronised with the first curtain and the shutter reamains
open for the reamining pweriod of time exposing the film/sensor with the
avaialble light. on the other hand in the rear curtain synchronisation as
the name suggests, the flash fires at the last part of the exposure
synchronised with the rear curtain which is finishing the exposure by
covering back the sensor/film. |
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Flash synchronisation at 1/60th sec Shooting Mode Manual
Exposure
Tv( Shutter Speed ) 1/60
Av( Aperture Value ) 9.0
Metering Mode Evaluative Metering
ISO Speed 200
Lens EF24-105mm f/4L IS USM
Focal Length 32.0 mm
Image Quality RAW
Flash On
Flash Exposure Compensation 0
White Balance Mode Auto
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Slow synchronisation should be used carefully. If the
subject is moving, the blur will be registered as well. |
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Shooting Mode Shutter-Priority AE
Tv( Shutter Speed ) 2
Av( Aperture Value ) 4.0
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 200
Lens EF24-105mm f/4L IS USM
Focal Length 28.0 mm
Flash On
Flash Exposure Compensation 0
White Balance Mode Auto
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Slow sync is a good option to show the self illuminated
background which is beyond the range of the flash. Either there should be no
ambient light on the main subject or it should be advised not to move. The
newyork skyline is very far off away from the influence of the flash, the
model has been advised not to move and the camera with flash is on the
tripod. |
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