The BG is actually the very dim green on the bottom, and the black. all I was getting was the burst and not the treeline because I was trying to get more color so I had the fstop at 22. and the exposure times were 5-10 sec. Basically it was hold down the button when the round went off and let go once the color runs out. that was usually about 8 sec.
Here is one from tonight time was only 2.6 sec. looks like I caught a mosquito:biggrin::
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This was from a place I go every year were they shoot them off over a lake. These guys have more money so they had twice as many going off at one time. and they were very bright. It is a toss up on your exp. times. but generally 5 sec is too many. Any more than that and all the color gets washed out.