Picked up an A28mm f2.8 recently, and tried it out Saturday while firing some mortar shells from my homemade launch setup.
Started out with three Roman candles.
The first shot I had the camera aimed too low.
So I raised the camera a bit.
That worked better, but I was still too close. I couldn't get any farther back, as the wires for the electric ignition are only so long, and I wanted to have the camera and the launch control close together.
I used a cable release, and bulb mode. Open shutter, fire shells, close shutter.
Next time, I'll have to use a wider lens, perhaps my Sigma 16,, f2.8 Rectilinear Fisheye.