Hey,
I've made a few TLs since installing magic lantern - wonderful software btw! I've mainly been shooting city timelapses at sunset, but as soon as the lights come on the buildings they overexpose (up to 3200 ISO!!), here's an example - I've reduced the exposures on the lights but still wish I could do better: http://www.youtube.com/watch?v=DSv5Sx2tW1U
So, can you manually set the maximum ISO for bulb ramping? I'd prefer it to adjust the aperture and exposure time, I usually use Manual mode.
This is on a Canon 600D, thanks in advance :)
Set your ISO on the Canon Menu(3rd Red Icon - couple of choices Max 400, 800, 1600 and up). I'm probably on the other end of the scale with my night scenes being a little under-exposed and found changing the aperture/intervals allowed me to keep it at ISO 100.