filming at 60fps vs 30fps .. strongest Image quality.

Rob B

Rob B

Hi all,

I am trying to build the flexibility of slo-mo into my shots.. Not that all of them are slow, but the ability to choose would be nice.. If I don't want slow motion, does it make sense to go back to 30fps?

For the strongest quality image I am assuming the following on my T3i.. (that is not here yet).

1. Shoot in Native ISO's - ISO 160, 320, 640
2. Shoot at 1/30 or 1/60 shutter speed (I assume if I shoot at 60fps, 1/60 is better?)
3. Shoot in 1080p ?
 
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I think you may be confusing a couple of factors, Rob.

1. ISO used to refer to the speed of the film emulsion. I'm not sure how that translates to digital SLR cameras, so I can't help you here.

2. Shutter speed for video is typically around 1/60th, unless you change it for sharper still frames. Standard video is 30 frames/second. The difference comes in whether you're shooting progressive or interlaced. Progressive is 30 full frames, interlaced is 60 half-frames (aka "fields"), but both play back at 30 frames. The image quality is the same for both.

3. 1080 = resolution, p=progressive.

For slo-mo, shoot interlaced and crank up your shutter speed. That will give you 60 sharp half-frames that you can interpolate into full frames in AE or Motion. For non-slo-mo, just experiment with the different settings and choose the look you prefer.
 
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if you want a good slow motion shot i suggest filming at 60fps and reducing it down to 24 fps in editing, however just for image quality 60fps is fine in itself overall the more fps the better
 
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can you get 60P out of the T3i? Even at a lower resolution? 720 for example. It will look great slowed down to a 24p playback and scaled up. If not there is a famous 60i slow mo trick but it doesnt look so good when you want the playback at real time without interlace artifacts..
 
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M8Tty1694 said:
just for image quality 60fps is fine in itself overall the more fps the better
Click to expand...

Unless there's some capability the T3i has that is different than a video camera, you're still confusing fields-per-second with frames-per-second. They are not the same thing. It depends on the look you're after.

And wheat, you can de-interlace the 60i footage and interpolate the missing scan lines for a full-resolution frame. Check out the shot in Crimps where the guy falls into the water. That was shot 60i and interpolated to 24p.
 
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The 550D, 600D, 7D and 1D Mk. IV all shoot 50 and 60 frames per second in 720p. For a 180° shutter, you'll want to use 1/100 and 1/125 (1/120 isn't available) respectively.
 
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What ive understood is Yes shoot iso if 160 320 ect rather than 100 200.
Your shutter should be double your frame rate or close too. I shoot 24fps for a more film look so shutter stays on 1/50th. Using aperture and nd filters to get exposure right. Shooting 60fps played back at 24 will give you close to half speed with no image loss rather than shooting 24 or 30 then sped up in post which just duplicates frames and looses image quality.

Owen
 
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What Chilipie said.

The Canon DSLRs only shoot progressive. 24,25,30 fps at 1080p and 24,25,30,60 fps at 720p.

You want to use a 180* shutter most of the time. That means double (or as close to it) your frame rate. If you know for sure that you don't want slow-mo, shoot at a lower frame rate with a higher resolution. Even if you know you're releasing the video in 720p, being able to crop the 1080 footage when wanted and keeping resolution is great.

As far as 24,25,30 fps... It depends on your final output. If you want it to look more like film, 24fps with a 180* shutter gives you a slight motion-blur film look. If it's being released broadcast, go 30 or 25 depending on whether it's NTSC or PAL, respectively.

There's a lot more to picking a frame rate and shutter speed than that, but thems the basics.
 
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Just thought that I'd mention that 720P gets an undeserved bad rap. Most football fans who watch games on Fox never realize thet are watching a 720P broadcast.

Most folks watching on a 60" Sony can't tell the difference between 1080P annd 720p.

Rant over. :cool:
 
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https://www.youtube.com/watch?v=-crSr7rvWIU


First day with camera outside trying to obtain a quality image, with t3i and Jag35 shoulder rig.

1080 24p, 1/30, f3.5, kit lens, 18-55mm at wide as possible, ISO 400, ND8 and ND4 filters equipped
 
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Rob B said:
https://www.youtube.com/watch?v=-crSr7rvWIU


First day with camera outside trying to obtain a quality image, with t3i and Jag35 shoulder rig.

1080 24p, 1/30, f3.5, kit lens, 18-55mm at wide as possible, ISO 400, ND8 and ND4 filters equipped
Click to expand...

Well, Alright! You got the baby home from the nursery. Looks good.

Bump your shutter speed up to 1/50, though, using 24 fps.
 
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CamVader said:
Well, Alright! You got the baby home from the nursery. Looks good.

Bump your shutter speed up to 1/50, though, using 24 fps.
Click to expand...

.. a question about that, I have some footage at 1/50 and I felt like it was strobing a little bit during panning. The 1/30 seemed better. I know the 180* shutter speed is a well known rule of thumb, so I'm wondering if my pan was too fast? ..or is there something else I missed?
 
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Rob B said:
.. a question about that, I have some footage at 1/50 and I felt like it was strobing a little bit during panning. The 1/30 seemed better. I know the 180* shutter speed is a well known rule of thumb, so I'm wondering if my pan was too fast? ..or is there something else I missed?
Click to expand...

Pans have to be slow and deliberate. Motion blur will be a problem at 1/30 when you have people or cars moving around.

You can switch over to 720/60 while you're getting the hang of things with the Jag.
 
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