30D and omnibounce

For the first time since I got my 30D, I took some shots indoors using my 430ex with and omnibouce. My shots turned out underexposed. I accidentally used ISO 400, I normally shoot on 100 with a flash.
I decided to test this a little and I determined, that with the omnibounce, my shots just don't look that good. They appear grainy and the coloring is odd when I used ISO 400. This was not a problem with the 350D.
They seemd fine with the omnibouce removed.

Anyone else using the same combination notice this?

another question:
Should the ISO be on anythign but 100 when shooting flash?

Here is a good unprocessed example:

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I don't use this setup but I do use a plain white paper card to bounce. I noticed after I downloaded the image and changed the levels you were also using a slow shutter. If you were using the ettl feature on the flash you can try switching to manual settings and bumping the flash up a little to compensate for the indirect flash. I ran some PP on the image it should come out fine other than the slight motion blur from the slow shutter speed.

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Crypto wrote in post #2252059
Should the ISO be on anythign but 100 when shooting flash?

Quite often you will want to boost the ISO even while using a flash, if you are trying to balance ambient light with the light from the flash and don't want your shutter speed to be too slow.

[QUOTE=Crypto;2252059]​For the first time since I got my 30D, I took some shots indoors using my 430ex with and omnibouce. My shots turned out underexposed. I accidentally used ISO 400, I normally shoot on 100 with a flash.
I decided to test this a little and I determined, that with the omnibounce, my shots just don't look that good. They appear grainy and the coloring is odd when I used ISO 400. This was not a problem with the 350D.
They seemd fine with the omnibouce removed.

Anyone else using the same combination notice this?

I have the same setup as you. What "mode" were you shooting in? "P" mode and "auto" use 1/60 sec. I have recently been shooting flash using AV mode. I turned on the Cfn that forces 1/250 second and usually use around F8 with my 17-55mm. What lens are you using for indoor flash shots?
Gerry

I was actually using AV and had the aperture at 2.8. I was using the 24-70. thanks

Try ISO200, shoot manual, something like f4, 1/100. Also if using omnibounce always compensate with EC (exposure compensation)

remo wrote in post #2257908
Try ISO200, shoot manual, something like f4, 1/100. Also if using omnibounce always compensate with EC (exposure compensation)

To OP: When shooting in AV you didn't mention if you turned on the 1/250 option in the Custom Functions?

I also use Manual sometimes as quoted here. I use 1/125 shutter and F6.3 as I found it best for my lens. Set it at 1/125 and do some testing by changing the F stop from F4 to about F8 under your normal shooting light. Review the pics and see what does the trick for your lens.. Gerry

ggw2000 wrote in post #2258239
To OP: When shooting in AV you didn't mention if you turned on the 1/250 option in the Custom Functions?

I also use Manual sometimes as quoted here. I use 1/125 shutter and F6.3 as I found it best for my lens. Set it at 1/125 and do some testing by changing the F stop from F4 to about F8 under your normal shooting light. Review the pics and see what does the trick for your lens.. Gerry

I did not change any settigns in the CFs. Thanks for the information