Yet another smoke thread...

no comment about the grain?

bump

as for grain, its hard to tell with the smoke, its hard to judge. personally I think you may be pixel peeping...the images are fantastic.
still, you might try it at iso100. I know with my 20d there is a noticeable improvement at 100. I do not use a flash, but from what I have read you should be able to keep aperture and shutter speed same, but crank up the flash power(??)

very nice attempt...

Thanks for sharing the image and the tip...

Avi