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What shutter angle for 29.97 Ntsc

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Ali Quintana
What shutter angle for 29.97 Ntsc
on Oct 31, 2013 at 5:05:00 am

I know that 180 is a good shutter angle for filming at 24 frames and gives a nice movie feel.

What if you are filming at 29.97? would you need to change the sutter angle to get the same nice movie feel? And if so, to what shutter angle should it be changed...


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John Fishback
Re: What shutter angle for 29.97 Ntsc
on Nov 2, 2013 at 6:58:41 pm

144 degrees. See this excellent article on shutter angle

John

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Ali Quintana
Re: What shutter angle for 29.97 Ntsc
on Nov 2, 2013 at 7:55:34 pm

Thank you, the article is very interesting.

What about 23.98 fps.... Is it better to film at 23,98 (instead of 24fps) if you plan to convert to 29.97 for NTSC TV?


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Peter J. DeCrescenzo
Re: What shutter angle for 29.97 Ntsc
on Nov 2, 2013 at 7:50:45 pm

Listed below are BMCC shutter angle and shutter speed equivalents.

Shutter settings and motion blur are an aesthetic choice. A relatively low shutter speed is (high shutter angle) results in more blur (smeared motion). A relatively high shutter speed is (low shutter angle) results in less blur (staccato motion). A 180 degree shutter angle is considered "normal", but you decide what's most appropriate for a particular scene or project.

Normal shutter angle of 180 degrees are shown below in bold.

So, for example, with 30p and 29.97p, a shutter speed of approx. 1/60th second is used to produce "normal" motion blur.

Note: The BMPCC pocket cam has a firmware issue that may cause the 180 degree shutter angle setting to produce smeary results. Users report the 172.8 degree shutter angle setting produces good-looking results, very similar to normal 180 degree shutter angle. Hopefully this issue will be addressed in a future firmware.

Shutter angle = Shutter speed:

@ 24p

360 = 1/24th sec.
324 = 1/26.66
270 = 1/32
216 = 1/40
180 = 1/48
172.8 = 1/50
144 = 1/60
108 = 1/80
90 = 1/96
45 = 1/198

@ 25p

360 = 1/25th sec.
324 = 1/27.77
270 = 1/33.33
216 = 1/41.66
180 = 1/50
172.8 = 1/52.08
144 = 1/62.5
108 = 1/83.33
90 = 1/100
45 = 1/200

@ 30p

360 = 1/30th sec.
324 = 1/33.33
270 = 1/40
216 = 1/50
180 = 1/60
172.8 = 1/62.49
144 = 1/75
108 = 1/100
90 = 1/120
45 = 1/240

---

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