I've never shot an evening dust storm before...but I was taking the night off when some buddies to the south told me a decent wall of dust was headed towards Phoenix.
I looked out and could see it over the mountain, so I packed up and drove 1/2 mile to a parking garage that of course I love! You may recognize it :)
I've been trying to use a Promote Control to do bulb ramping but I've been having difficulties learning how it works...probably because I don't practice beforehand and just try to use it on the spot! I swear, I don't read manuals, I don't prepare and I don't practice...it's like baptism by fire.
One camera was using the Promote Control and it did do an "okay" job at ramping up the exposure as the sun went down, but I wished it had been better.
The second camera was just set at 4 second exposures and locked with a shutter release cable.
First camera was the Canon 5D3, Rokinon 14mm f/2.8...second was a 5D2 and Canon 17-40mm f/4 L. I used the lens twist method with the 17-40 and I've been loving that little tip.
Thanks to James Menzies and Bryan Snider for keeping my lazy butt updated on the dust storm :)