Magic Lantern Forum

Using Magic Lantern => Shoot Preparation => Topic started by: adrjork on September 17, 2019, 05:02:05 AM

Title: Reduce Motion Blur in car-side-window shooting?
Post by: adrjork on September 17, 2019, 05:02:05 AM
Hi everyone,

I need to make some shots of trees, houses, etc. with a 4-axis gimbal, through the side window of a car running at 30-35 Km/h.
I made some test and I noticed that at T/50 the motion blur is really disturbing. I also tried T/84 and even T/100 and obviously this reduced the motion blur, but added the typical jerkiness of rapid shutter times.
Then I tried T/64 and I must say that to me this is the best compromise out of the camera.

Anyway, I also tried to handle the T/100 footage in Davinci: slowing it down a bit (20 fps), adding optical flow and just a little bit of motion blur. And the result seemed good to me.

My question: which one in your opinion gives the best result? Shooting at T/64 without touching it in post, or shooting at T/100 and then re-touching it in post?

Thanks a lot.
Title: Re: Reduce Motion Blur in car-side-window shooting?
Post by: Luther on September 17, 2019, 05:49:24 AM
What FPS are you recording? ML has a feature called "FPS Override", which provides some options regarding the "jerkiness" you talked about.
I personally always record at 24.000 FPS (using "Exact FPS" in the FPS Override menu) and with 1/48 shutter speed. This is called "180-degree rule", in case you want to research...

Quote from: adrjork on September 17, 2019, 05:02:05 AM
slowing it down a bit (20 fps), adding optical flow and just a little bit of motion blur.

Hurr. This doesn't seem good to me. Adding frame interpolation will mess your footage and won't provide any benefits.
Title: Re: Reduce Motion Blur in car-side-window shooting?
Post by: adrjork on September 17, 2019, 04:26:53 PM
Hi Luther, thanks for your reply.

I shoot at 25 fps with Canon menu at 25 fps, and "also" FPS Override at 25 fps "Exact FPS" (I don't know if that gives any benefit...) And then I conform 25 fps to 24 fps in post (so the result is just a little-little bit slower).

1/48 shutter speed (in my case 1/50) seems too blurred to me (for this specific kind of shot). As I wrote, it seems to me that the best out-of-the-camera compromise is 1/64... But some doubt remains...