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A Picture's Worth a 1,000 Words...So Here's Two
In reply to TOF guy,
3 months ago
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TOF guy wrote:
Fave Photog wrote:
michaeladawson wrote:
Fave Photog wrote:.
The determining factor is background exposure (not flash, the flash just fills in).
Rear sync is not needed for FILL flash. Front sync works just fine with fill flash. The purpose of REAR sync is to freeze subject motion as described in my above reply.
That is not the "purpose" of rear sync flash.
Another person who doesn't understand the difference between front and rear sync.
You can freeze a subject just as easily with front or rear sync.
True, but it's what occurs AFTER the flash fires that matters. As EXPLAINED, with front sync, the flash fires as soon as the shutter opens. Therefore, any movement by the subject AFTER the flash fires, but before the shutter closes, will cause the subject to become blurry due to motion blur, thereby causing the subject to appear out of focus.
That problem does not occur when using rear sync, because in rear sync mode the flash fires IMMEDIATELY before the shutter closes, thus NOT allowing any subsequent movement by the subject to be recorded.
Use a shutter speed that is too long (as when trying to capture ambient light) and you will also end up with a blurred subject with either method.
Actually Mike is 100% right.
Actually, he's 100% wrong, and that makes you just as wrong for agreeing with him.
In any case the "freezing" due to flash occurs because the flash pulse is very short (typically about 1/1000 sec or faster with a Nikon flash). The ability to freeze motion is therefore the same whether the pulse occurs at the beginning or the end of the exposure.
Look, this really isn't a difficult concept to grasp...for most. I'll try one more time just for you two.
It's not an issue of what happens DURING the micro-second that the flash fires and 'freezes' the subject. It's what happens AFTER.
Using Front Curtain Sync, the motion blur created AFTER the flash fires gets imprinted on TOP of the 'frozen' subject, thereby causing the edges to become blurred and also creating all sorts of unwanted ghosting on the subject. Please see the attached image titled 'Front Sync'.
Using Rear Curtain Sync, the opposite happens - the subject gets imprinted on TOP of the motion blur that occurred BEFORE the flash 'froze' the subject, thereby causing the edges to remain sharp, distinct, and with no unwanted ghosting. Please see the attached image titled 'Rear Sync'.
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The Five 'Ps' of Photography:
*Proper Planning Prevents Poor Performance!*
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