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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 20 Aug 2010 (Friday) 05:22
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on board flash - focus assist?

 
hania
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Aug 20, 2010 05:22 |  #1

I was on a boat trip recently and another photog and I had the same kit: 7D and 100-400 IS.

I was puzzled to see that he kept his on-board flash firing all the time (photos of seals etc. from boat).
Didn't like to ask him why he had it firing - this was on a very sunny day and the seals were at least 20 feet away.

I thought focus assist was used with an external flash & generally used when in dark conditions to help the camera focus? or am I missing something?


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PacAce
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Aug 20, 2010 07:16 |  #2

Maybe for catch-light in the eyes? Otherwise, I can't think of any other use for the internal flash since it'd probably be useless with a 100-400 lens mounted, especially with a hood on. And, like you said, focus assist from the internal flash will not kick in until it gets dark enough to require it.


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hania
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Aug 20, 2010 09:57 |  #3

PacAce wrote in post #10755714 (external link)
Maybe for catch-light in the eyes? Otherwise, I can't think of any other use for the internal flash since it'd probably be useless with a 100-400 lens mounted, especially with a hood on. And, like you said, focus assist from the internal flash will not kick in until it gets dark enough to require it.

Thats what I thought - sometimes I need to have more confidence in what I know...............


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Curtis ­ N
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Aug 20, 2010 15:51 |  #4

Maybe the guy didn't realize that it will always fire if it's popped up.

Sad thing is, it will limit shutter speed to 1/250 and if it's sunny and he's in Av mode this can cause terrible overexposure.


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PacAce
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Aug 21, 2010 11:56 |  #5

Curtis N wrote in post #10758245 (external link)
Maybe the guy didn't realize that it will always fire if it's popped up.

Sad thing is, it will limit shutter speed to 1/250 and if it's sunny and he's in Av mode this can cause terrible overexposure.

Hey, Curtis. Long time no post, huh? Glad to see you back posting again. :D


...Leo

  
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Curtis ­ N
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Aug 21, 2010 21:21 |  #6

Hey Leo.
Good to see you're still here.

I've been pretty busy and that won't change anytime soon.
It's nice to know the forum has survived during my absence.


"If you're not having fun, your pictures will reflect that." - Joe McNally
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r.morales
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Aug 22, 2010 10:00 |  #7

I use the pop up for catch lights in eyes , jewelry , condensation on drinks , Maybe he was hoping for catch lights in waves .
Generally an animal will look towards a flash . I don't know if the pop-up works in manual , if it does , maybe ? If it works in Manual does it limit me to 1/200 ? [XTI]
If I can I always try to ask questions .


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PacAce
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Aug 22, 2010 19:28 |  #8

r.morales wrote in post #10766074 (external link)
I use the pop up for catch lights in eyes , jewelry , condensation on drinks , Maybe he was hoping for catch lights in waves .
Generally an animal will look towards a flash . I don't know if the pop-up works in manual , if it does , maybe ? If it works in Manual does it limit me to 1/200 ? [XTI]
If I can I always try to ask questions .

The only EOS camera that has an internal flash that can be set to Manual mode, as far as I know, is the 7D. In all others, the internal flash always works in ETTL mode.

If an external dedicated flash is used, the shutter speed can be set to higher than max sync speed if the flash is set to HSS mode. This is true whether the flash is in ETTL mode or manual mode.


...Leo

  
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r.morales
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Aug 22, 2010 23:38 |  #9

PacAce - thanks
I seldom use manual - I have not even used the 580 II in over 3 months .


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krb
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Aug 22, 2010 23:49 |  #10

hania wrote in post #10755474 (external link)
I thought focus assist was used with an external flash & generally used when in dark conditions to help the camera focus? or am I missing something?

There is a focus assist with the popup flash, you can tell the difference between FA and normal flash firing because the focus assist is a buzzing sound and flickering light.


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on board flash - focus assist?
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