My long exposures mean bulb shots of 1 to 30 seconds.I may also use multiple exposures, in which I overlap exposures. ICM is sometimes used in combination. I have lumped all of these techniques together here and categorized them as bulb.
The relationship between shutter speed, exposure, and ISO sensitivity is instantly calculated and photographed, without the use of any filters. Although sometimes governed by chance, I try to shoot reproducibly without relying on chance.