Flash motion photography

Pfc. Amber Nolan, 450th Civil Affairs Bn., rucks across Fort Meade, Md. during the 352nd best warrior competition on April 2, 2012. (U.S. Army photo by Staff Sgt. Felix R. Fimbres)

   Wow, it's been a busy couple of weeks for me personally. But it's time to get back on the photo bus. So lets get back to it shall we.

   I know, I know I've been extolling the virtues of flash for what seems like forever; I'll get off my flash horse after this post. I promise. [No, that's probably a lie, but I'll give it a rest for a bit!]

 

Points of interest. Check. Yellow road line leading to subject, check.
Orange/white line leading to subject, check. But those eyes, they just keep pulling me off the frame...sigh. 

   I'm not going to lie, I like this photo. It's not technically correct either, I mean, just look at those eyes pulling me off the frame. Yuck. Okay fine, clear subject, leading lines, subject is in points of interest. The exposure awesome. It's technically pretty good. Just not flawless.

   When I shot this however my concern was getting the patch included in the shot. As a public affairs soldier I was always looking to brand my images. I could go on an on about all the good stuff my unit does on a daily basis around the world, but we certainly don't have very much name brand recognition, at least not yet anyway. But lets get back to this shot.

   Unfortunately a side effect of using flash to get blur is, well, you get blur where the flash doesn't shine.

   [Bad pun. I know. I'm pretty sure you're here FOR the puns tho... right?]

   So the patch itself is a little blurrier than i would have liked it, and her eyes aren't looking over her shoulder, but that's uncontrolled action for you. Having a second flash to specifically light her her patch would have done the trick; [at least in my head it does, using just theory] as it stands there wasn't enough umph to get the black portions of the patch clear.

   

   Luckily her eyes and face are crisp and clean. The flash helped the colors [what little colors that are] on the subject really pop. And most importantly I captured motion.

   Yes, flash freezes motion [surprisingly I haven't done a post about how to use flash to freeze motion...don't worry I'll talk about some other subjects before I go back to flash] but with careful management of your shutter speed you can use it to mix and match both movement and the lack thereof. 

   What we're seeing here is 1/30 of a second [at f/22] which isn't a very long period at all, but it's twice as long as 1/60th of a second [What I normally shoot for blur free objects which are standing still] and it's glacially slow when compared to most sports shots which are shot in the high hundreds and even thousands. 

   So really, 1/30th of a second is a heck of a long time.

   Just not at night.

   In regards to light, specifically the light bouncing off our subject, the blur part you see around her is where she was at the beginning of the 1/30th [lets just call this the first half of the 1/30th of a second] and the crisp parts of here is where my flash went off, and captured her [lets call this the second half.]

   I used the "rear shutter" on my camera to ensure my flash went off at the end. This gives it some forward/upward motion. You'll have to open up your manual to find out how to make your camera use the flash on the rear shutter. If I had used the flash normally it would have given the effect of backward motion as the flash would have fired during the first half and then blur collecting during the second half; so the blur would have been in front of the crispy parts and not behind the crispy parts.

Which by the way is what happened with her sleeve. While her body was moving towards the camera her arm was going away from the camera, so the blurry part happens in the first half and the stop motion happens in the second half, causing blur in front.