>>2964253I am doing almost exclusively long exposure ND shots. I use a 6 and a 10 stop filter, sometimes at the same time. Most of my shots are 300 to 600 seconds in broad daylight.
-The longer the shot the bigger the issue with light leak, so always stand between the camera and the sun and use tape or a hat over the camera to prevent light leak.
-The longer the shot the more hot pixels become an issue. Use digital noise reduction in camera or post process out the hot pixels.
-Always try to shoot with partly cloudy or overcast skies.
-Compose the shots without your heavy filters, then be sure to set to manual focus mode if not already before snapping the shot. Be extremely careful not to screw up the focus when twisting on the filter.
-Obviously you should be in manual bulb mode and using a shutter lock (super cheap one works fine).
