Underexposed Pictures

[Burdy]

Maybe I ask a stupid question, but why are my pictures taken with my 10D and a 380EX flash constantly underexposed? (I have correct them with +2/3 stop)

I have read somewhere that this is because the crop factor of 1, 6.

Is this possible or maybe something is wrong with the 380EX?

Of course I can use the FEC to correct it.



Thanks in advance



Bram

[Jon]

I have correct them with +2/3 stop

Cra^hop factor has ABSOLUTELY NOTHING to do with it. (Sorry - just wanted to stop any discussion on this red herring before it starts.)
What mode are you shooting in? In the BASIC zone, the flash will take priority; if you're in a creative zone, the camera will try to get an available-light exposure and just use the flash as a kicker. If you mean that you've used regular exposure compensation of 2/3 stop, that won't affect the flash specifically. Canon's default E-TTL setting is for the flash to give around 1/2 stop less than the ambient light, so it acts as a fill-in flash rather than as a primary light source.

[Burdy]

Hi Jon,

Thanks for your quick reply.
Here same more information.
I have used a 10D with a 17-40L f4 and the camera was set on the P mode.
I used a Omnibounce on the 380EX.
I was shooting in a church with low light so I put my camera on ISO800.
I shoot always RAW.

Bram

[Jon]

With an OmniBounce on in a large area, especially if your subject's at any distance, the 380EX may not have enough oomph. Without OmniBounce, you'd have a range of about 10 m. With it, you'd lose about 2 stops (rough estimate), so maybe 2.5 m would be your max. reach.

[Burdy]

Tank Jon,

Its clear to me, its the omnibounce who takes the light!
I think I need more flash power.
Maybe I ask a 580EX as a Christmas present!!

Bram

[Jon]

Sounds like a plan. Maybe even two!