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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 17 Jan 2011 (Monday) 23:59
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why does this happen ??

 
canusa
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Jan 17, 2011 23:59 |  #1

Here's the pic..

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'


is the 430exii just simply not strong enough for the high ceilings ?? or am i doing something wrong.

taken with the xt and 10-22
10mm
f5 1/13sec
iso 200.

thanks in advance.

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andrersa
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Jan 18, 2011 00:02 |  #2

The inverse square law perfectly at work




  
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macroimage
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Jan 18, 2011 00:11 |  #3

canusa wrote in post #11663417 (external link)
is the 430exii just simply not strong enough for the high ceilings ?? or am i doing something wrong.

If you are trying to reduce the contribution of the ambient light, then increase the shutter speed up to the flash sync speed of 1/200s. Then the flash will be the main light source. If there isn't enough flash power left to get a full exposure, then open the aperture further first then increase the ISO and adjust the flash angle until you are happy with the pic. F/3.5 at 10mm will still give enough depth of field. You could also raise the camera higher and keep it more level to reduce the keystoning.


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k.CHU
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Jan 18, 2011 00:26 |  #4

i think the ceiling arent that high.. if ur using ETTL up ur flash exposure compensation... u can also increase ur ISO, or open up ur aperture more.


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canusa
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Jan 18, 2011 01:02 |  #5

i didn't use f.e.c. at all. Forgive me for my rookiness... but if i used fec wouldn't that just up the exposure of the whole picture? just making the " keystoning" (i guess thats what its called?) still present?


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macroimage
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Jan 18, 2011 01:11 |  #6

Flash exposure compensation only increases the flash portion of the exposure, not the ambient portion. Flash metering is separate. FEC just adds to the flash exposure after the flash exposure is calculated.


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canusa
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Jan 18, 2011 01:25 |  #7

clearly i have more to learn than i had previously thought.

So, fec increases the flash portion of the exposure , by telling the flash to output more light.
i thought ettl was doing that for me?


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Headshotzx
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Jan 18, 2011 01:31 |  #8

E-TTL can be tricked into thinking that it's exposing correctly.

Lets think of it like you're just shooting without flash.
When you point your camera out with half of the frame being a bright afternoon sky, your camera will automatically adjust its settings to get you what it thinks is the correct shot (assuming you are in Av/Tv/P or auto mode with evaluative metering). Your picture will turn out dark to your eyes because the camera thinks it has to balance out the white sky to become 18% grey.

Vice-versa with a man dressed in black against a dark background - your camera will expose higher than your eye sees and the black will turn into 18% grey.

For both of the above situations, you'd need to key in exposure correction into your camera. It could be just a third of a stop, or it could be three stops, depending on your situation / frame.

Flash TTL behaves the same way, except that the pre-flash + computer determines the final flash output.


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yogestee
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Jan 18, 2011 04:48 as a reply to  @ Headshotzx's post |  #9

To me it looks like there is an uneven light distribution from the bounced flash.. To things can cause this,, too close to the subject and/or bounce angle is wrong..


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apersson850
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Jan 18, 2011 06:41 as a reply to  @ yogestee's post |  #10

I agree.


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k.CHU
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Jan 18, 2011 07:09 |  #11

yes FEC will only increase the flash output... but this is still possible to get a clean pic from top to bottom if it was bounced high and behind you, or to the left wall?


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munzzzzzzz
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Jan 18, 2011 08:12 |  #12

The zoom range of the 430EXII is 24-105mm, or 14mm with the wide-angle diffuser in place. The fact that the top of the image is brighter than the bottom leads me to believe the flash wasn't pointed straight-ahead (assuming you were shooting in portrait and this isn't a cropped image), but even if it was, according to the specs you'll never get full coverage at 10mm unless you are bouncing. In this case it almost looks to me like you were bouncing, but had the flash pointed too far forward.


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canusa
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Jan 18, 2011 13:20 |  #13

i was bouncing off the ceiling. flash pointed straight up. there is no left wall to bounce off of.


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jffuerte
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Jan 18, 2011 15:36 |  #14

I think increasing FEC and the ISO a bit would do the trick


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Titus213
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Jan 18, 2011 16:04 |  #15

You shot at 10mm. What's the max wide angle setting for the 430EX II with the wide angle diffuser lowered? The wide angle panel on the 430EX will take it out to 14mm.


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why does this happen ??
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