T3i sync high speed with popup flash?

When shooting outdoors with a light background, it would be nice to be able to use the flash pop-up as a fill light (to the shadows on a face, etc..). However, the shutter speed is set to 1/200 when the popup flash is in place, overexpose the scene. Is there a reason why the pop-up flash can't sync high speed like an external flash to allow a faster shutter speed and always get a filling?

Thank you

David

It has to do with the amount of energy is available for the flash.  A more powerful flash can more easily manage the sync high speed.

Sync and sync high speed are related to the work the Shutter curtain on any SLR digital.  There are two doors.  A slides open, and close other slides.  The reason for which there must be two doors (instead of one) is because that if there is only one, then the door would slide open, then reverses to slide.

Assume the following scenario were true:

Suppose it takes the shutter a full 1 second door to slide open.  If we set an exposure time of 2 seconds, the following should happen if there was only one door.

-l' shutter starts to slide open from left to right, allowing light to reach the pixels on the left edge of the sensor.  The right edge is always in the dark.

-as slides of doors, more and more pixels are eposed to light.

-a second later reached the opposite end and all the pixels are exposed to light, but the door must immediately reverse and start close because it will take a full second to slide the door closed.

-the door begins to move and immediately the pixels on the edge of most on the right are in the dark, because they are covered by the shutter, but the pixels on the left edge are still exposed to the light.

-the door has finally reached the edge against a second later and no pixel is exposed to light.

Think to what just happened... the pixels on the edge of 'left' of the sensor got a second exhibition 2... but the pixels on the right edge of the probe were barely exposed for a fraction of a second.  You'd have a horrible blow to look.

To resolve this problem, the camera uses TWO doors... begins a sliding open... the other follows a moment later (based on the selected shutter speed) and starts sliding closed.  Now, all pixels are exposed for the same period of time, regardless of the shutter speed you use.

But the reality is they are mechanically sliding doors and it takes time to move.  Flash sync speed is shortest possible exposure that can be turned where the first door has enough time to COMPLETELY slide open so that when the flash goes off, the entire sensor is exposed and benefit of lightning.  The second door can slide THEN closed.

If you do not use flash and you set a very fast shutter speed (say 1/1000th) the second door actually starts closeing long before the end of the first door opening.  In fact the second door is "hunting" the first establishes a "slot" which sweeps the sensor.

With this in mind... now think just what a flash how to predict sync high speed.

Assume that your camera has a maximum speed of flash-sync of 1/200th, but you want to shoot at 1/400th.

This means that the first door must begin to open.  When he reached the midpoint, the flash must trigger to light the subject - but half the sensor did not lightning.  The second door closes as the first door continues to open up.  When the first door reaches the opposite edge, the second door will now be in the middle.  The flash needs to fire AGAIN - this time to expose the pixels on the 2nd half of the sensor.

This means that the flash should fire TWICE in quick succession and the impulses must be PRECISELY 1/800th second (half or your second 1/400th total exposure times) apartment.    No flash would be able to recycle in just 1/800th dry if she gave a burst of the power of the light.  In other words, that it must reserve at least half of its power for the second round.

If you increase the shutter speed to 1/800th... now the flash to trigger FOUR times and no single burst may be stronger than 25% of the power of lightning - and gusts must precisely timed occurs 1/1600e seconds, independently of the other.

You can quickly see how this is going to require a flash with a power or you won't be able to finish the sync high speed on something more than just a few feet.

For the light of day, the most brilliant exhibition is going to be the sunny 16 rule... f/16 with the shutter speed, the value in contrast to ISO.  So, for 100 ISO, you can use 1/100th sec.  To f/8, you can use 1/200th (and now you are still below the max flash sync speed).

Tags: Canon Camera

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