Tom,


Thanks for your tips! No, you're giving me good ideas, I'd like to hear how other people will do if the same problem is encountered, so don't say that.


Let me clarify a little bit. I basically want to take a long time exposure nigh landscape shot with a person properlly lighted in it. Because of ambient lighting, the person is always blurred after 10 seconds or even longer expoture times, plus the ambient light gives awful colors of the human face... I perfer to use a flash, a flash will light up the person properlly while keep every feature sharp. But the problem is how can I embed the flashed person into a long time exposure without being affected by the ambient lighting.


There does not seem to have a solution other than multiple exposures, but I'm clueless about how that may work.


I typically use ISO under 400 for such a purpose, most of the time ISO 100 or 200. Lens is a wide angle such as 16-35L or 24-70L kinda stopped down (f/5.6 or even smaller) since it's after all a landscape shot and I need the DOF.


Ben