Sorry. Missed this comment. I'd take a guess at about a 5 minute exposure. The spirals are dead quick so it is only really the central design which takes time.
To do that, I use luminous dots on the floor so I know where I am
Sorry. Missed this comment. I'd take a guess at about a 5 minute exposure. The spirals are dead quick so it is only really the central design which takes time.
To do that, I use luminous dots on the floor so I know where I am
RE: A study in circles: long exposure photography