Shooting Slow Motion Muzzle flashes

[Leland Krane]

Since these cameras have electronic shutters, how do I avoid frames that roll with half a frame exposed--Back when I was shooting film I used a slow burn flash bulb-see link below- any advice? Don't say do it in post. The turnaround time in post will not allow- any help would be appreciated.

https://vimeo.com/9288328

[J.D. Frey]

You can change the shutter angle to get more (or less/faster) exposure per frame regardless of the fps. You can also set the camera for relative shutter. When you change the fps the camera will do the shutter math for you. So you could set it to 180 at 24fps, click the relative option then move the fps. At that point the shutter should stay at 180. Be aware that you may need to accommodate with more or less lighting depending on the situation. Depending on your setup there is probably a sweet spot you would need to find with a few test shots.

[ericyoung]

Shutter angle won't help the rolling shutter partial exposure.

A slow burn flash bulb will help - basically flash duration needs to be comparable to the frame duration of the camera and have relatively slow fade up/fade down times to avoid partial frame illumination.

Or you could try the Tessive shutter accessory at the expense of significant light loss, which masks the effect:
http://reduser.net/forum/showthread....d=1#post780397

[Marc Wielage]

Don't say do it in post.

Shoot it on film!