Saturday, August 30, 2014
Shooting star trails was a mystery until I recently watched the B & H video on night photography presented by Gabe Biderman. One of the take away messages was converting exposure at ISO 6400 to exposure at ISO 100. I may have mentioned this method on an earlier post but here it is again. Take the exposure at ISO 6400, keep the same f stop, change the ISO to 100, then covert seconds to minutes. I use aperture priority to get the initial shutter speed, then change to bulb for the actual shot. This was a 15 minute exposure facing north with a faint limb of the Milky Way and city lights showing. The image was cropped to vertical because of the bright ground lighting to the east. Give it a try.