“Now here’s the trick: drag the shutter. What that means is, set your flash to expose properly for a compromise speed… say, 1/60th of a second. Then, set your camera to instead expose for the proper 1/15th of a second that the background needs. What will happen is that the flash will “freeze” your subjects long enough to get them crisp and in focus, but because the shutter is left open slightly longer, the light from the city can bleed into the shot and properly expose. The only side effect is that you might have a very slight “ghost” halo around your sharply-exposed friends (if they’re moving around). But this is a small, small price to pay for a really good night-scene shot with flash and friends.” — Fiat Lux! #protip
