More details on the result with some wedding sparklers photos can be found here: http://www.raraaphoto.com/single-post/2015/08/15/Calgary-Montreal-Wedding-Photographer-How-to-Take-Sparklers-Photos
Tonight at twilight, I ran some tests with sparklers. As usual, Ange was the subject of my trials :D.
So on the photo below, she moved a bit, hence the blur. It is very crucial to let the couple know to stand absolutely still for around 13 seconds.
On the photo below, she was more still, but I will try to do other trials on tricks to eliminate the in-and-out trails. I most likely will try to bring a glass of water with me, and turn the sparklers off right after I was done with the shape.
The phone below taught me to pay extra attention on the shape, and especially to leave a gap in front of the subject so that the face can be clearly seen on the camera.
