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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 15 Jan 2012 (Sunday) 22:03
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Flash Exposure Compensation and Pixel Kings

 
rh18
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Jan 15, 2012 22:03 |  #1

I'm new to off camera flash and I can't figure out what I'm doing wrong with FEC. (Or if there is a problem with the Pixel Kings.) Basically, it seems to have no effect when I dial in FEC - I'm getting the same exposure no matter what I use for FEC. I'm using my T2i with a 430ex II speedlite (and obviously the Pixel Kings).

In the pictures below, the first has no FEC set. I wanted to bring down the exposure a little, so I hit the Q button and bumped the flash exposure compensation down a little. It didn't seem to make a difference, so as a test, I dialed it down to -2. No difference.

So I don't know if I'm doing something wrong or if I'm not understanding what FEC should be doing. I'm at a loss - any ideas? Is there some setting I'm missing or should be checking? Also, can someone else with the Pixel Kings confirm that FEC works with these triggers? I did check the flash menu and the mode was set to ETTL and I had it set to 2nd curtain flash if that matters.

1/200 3.5 ISO100 FEC 0


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1/200 3.5 ISO100 FEC -2

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booja
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Jan 16, 2012 00:01 |  #2

my FEC works with my pixel kings... very odd yours doesn't make a difference




  
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CliveyBoy
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Jan 16, 2012 02:20 |  #3

I think that there is little or no flash lighting in the image. FEC will not profuce less light than the minimum!

Establish a good no-flash exposure; switch to camera Manual mode and set the exposure 2 stops down. Turn on flash and test the FEC range again. You should now see differences.

Your setup and the Kings are fine using FEC.


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rh18
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Jan 16, 2012 07:17 |  #4

CliveyBoy wrote in post #13711730 (external link)
I think that there is little or no flash lighting in the image. FEC will not profuce less light than the minimum!

Establish a good no-flash exposure; switch to camera Manual mode and set the exposure 2 stops down. Turn on flash and test the FEC range again. You should now see differences.

Your setup and the Kings are fine using FEC.

Hey Clive, thanks for your thorough review of the Kings! That was really helpful when I was deciding on remote triggers. (Now if I can just figure out how to get them to do what I want. :))

Back to you point... first, I hope I'm not misunderstanding you but I'm fairly certain the flash was not operating at minimum power. The ambient in the room was a couple low wattage bulbs in table lamps.

Here is a shot from earlier in the session where the flash didn't fire (too quick with the trigger) but I think it provides a good example to address your point. This was shot at 1/60 to bring in a little more of the ambient at 3.5 with no FEC I was shooting in AV at the time).


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The 2 shots from my original post were shot in manual so I could get a more controlled test. I also did some shots with the flash on manual and at 1/4 power the shot was quite dim. I was bouncing off the ceiling from the other corner of the room if that makes a difference. (Room size is about 10ft x 10ft.)

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rh18
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Jan 16, 2012 21:26 |  #5

I'm not sure what happened last night. I did some more testing tonight and it seemed to work fine. Maybe I didn't have the flash all the way in the hot shoe or something. Weird.

Thanks for the replies.


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CliveyBoy
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Jan 16, 2012 23:22 |  #6

rh18 wrote in post #13716689 (external link)
I did some more testing tonight and it seemed to work fine. Maybe I didn't have the flash all the way in the hot shoe or something. Weird.

That sounds likely - it happened to me today!


Clive, and Great G/D Abbie
50D; 580EXII, 430EXII, 550EX, YN685EX; YN-622C II, YN622C-TX and YN560-TX controllers TOYUG II v5.10 YN622 System Guide (external link)
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Flash Exposure Compensation and Pixel Kings
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