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Home: Video University Forums: Digital Photography for Videographers:
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Brackish
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Dec 17, 2005, 6:26 PM

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mcv
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Dec 18, 2005, 12:49 AM

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Re: [Brackish] Is pre-flash a good thing? [In reply to] Can't Post
Yah. Closed eyes are a desirable feature for many photogs.


WLR
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Dec 18, 2005, 1:45 AM

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Re: [Brackish] Is pre-flash a good thing? [In reply to] Can't Post
Some cameras have a redeye reduction feature which emits a strobe effect burst to get the pupils to react and close a bit in time for the main flash. Another thing I've seen with my 20D is that if there is insufficient light available for the autofocus to work, the flash will do that strobe burst thing to give the autofocus sensors something to lock onto.


Friends don't let friends shoot jpeg.


Brackish
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Dec 18, 2005, 2:56 AM

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Dieps
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Dec 18, 2005, 12:28 PM

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Re: [Brackish] Is pre-flash a good thing? [In reply to] Can't Post
In Reply To
In Reply To
Some cameras have a redeye reduction feature which emits a strobe effect burst to get the pupils to react and close a bit in time for the main flash. Another thing I've seen with my 20D is that if there is insufficient light available for the autofocus to work, the flash will do that strobe burst thing to give the autofocus sensors something to lock onto.
That I didn't know. Does it seem to make their eyes go shut for the
main flash?
No, the pre flash is bright enough to close the pupil a bit so there is less reflection from inside the eye. Its the reflection that causes red-eye. You notice cats have a lot of red-eye? That's because they have big pupils so they can see in lower light.

Jim


PD-170, VX-2000 (2), TRV-900
Sony Wireless, iRiver, Mini Discs, other stuff
Canon 20D with some lenses


jt53787
Novice

Dec 20, 2005, 4:21 AM

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Re: [Dieps] Is pre-flash a good thing? [In reply to] Can't Post
I'm shooting Nikon with an SB800 and don't notice too many people blinking. Nikon's flash technology is stellar though! The pre-flash is part of the metering system as well as the wireless transmission system for other Nikon wireless flashes. And somehow those wireless flashes can tell what TTL setting to be at. It's crazy, but works awesome!!


Mark C
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Dec 21, 2005, 2:48 AM

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Re: [jt53787] Is pre-flash a good thing? [In reply to] Can't Post
It works great for the stills...but sucks when you are videotaping the event and have the strobe effect.
Mark C

Edmonton, Alberta
www.markitcreations.com


jt53787
Novice

Dec 21, 2005, 11:48 PM

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Re: [Mark C] Is pre-flash a good thing? [In reply to] Can't Post
LOL...yeah that is true Wink
Another reason why I moved away from video at weddings...Lighting!!


Xray
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Dec 22, 2005, 12:09 AM

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Re: [Dieps] Is pre-flash a good thing? [In reply to] Can't Post
When it comes to cats and dogs... OR people on the other hand:
http://photonotes.org/...h/index2.html#redeye

(very interesting article)

Marcin
_______________________________________________________________
If it's sent by ship then it's a cargo, if it's sent by road then it's a shipment.


Brackish
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Dec 23, 2005, 7:46 AM

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abracadabra
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Dec 24, 2005, 5:53 AM

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Re: [Xray] Is pre-flash a good thing? [In reply to] Can't Post
Won't remove red eye, but raising the flash on a flash bracket will. Also, best to use a diffuser and or bounce the flash.


jt53787
Novice

Dec 26, 2005, 3:02 AM

Post #12 of 12 (949 views)
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Re: [Brackish] Is pre-flash a good thing? [In reply to] Can't Post
He's saying that from a videographer's perspective the pre-flashing is annoying.
I'd have to say that you don't even need to worry about it. I shoot wedding full-time and don't seem to run into any issues.
It is a phenomenal flash though! Definitely worth the money.

Just get it and you won't regret it.