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Slow Motion Characteristics

Framerate / frames per second

Calculation of the slow motion factor

If a SloMo cam can record for example 240fps, then a slow-motion effect of 10x times can be achieved. This means you can slow down the original recorded video 10x times.

This results from the calculation: 240fps/24fps = 10x

  • 240fps is the recorded frame rate of the SlowMo camera
  • 24fps is the frame rate at which the SloMo video is rendered (=played back)

That's why 24fps playback framerate is best for slow motion Shots. If we playback the video at 30fps instead of 24fps, we would only get a slow motion factor of 8 (240fps/30fps = 8). So always playback the recorded highspeed videos with 24fps to achieve the maximum slowdown.

Resolution

Bitrate

In the case of slow-motion videos, the bitrate is the number of bits recorded per second. Since the term byte (in particular megabyte) is more familiar to many, I use it. The converting factor is eight. 1 byte is equal to 8 bit.

If a SloMo camera can record videos at 100Mbps (=Megabits per second), this means that 12.5 MB/s (=Megabytes per second) of video data is written to the memory card. The higher the bitrate per second, the better the quality of the video. It is possible, if you record a highspeed-video in 4K with a low bitrate, that a video recorded with "only" Full HD will have a better quality. So the bitrate criterion should not be neglected. Especially when buying the memory card for the slow-motion camera, the biterate must be considered.

Other

Here are listed other important slow motion characteristics, which are important.

Manual operation

Lighting conditions

When high frame rates are recorded, this results in a low shutter speed. For example, if 1000fps is recorded, a shutter speed of at least 1/1000 must be selected. The camera's aperture is usually opened completely at such high frame rates. The third parameter, the ISO value, can then be adapted. If the lighting conditions are not good and the ISO value is too high, you get noise in the video, which is reflected in poor video quality. You can find more details about the lighting conditions in this blog post.

For us this means in summary:
We give the SloMo camera as much light as possible, so that the ISO value remains as small as possible.

Mobility

This aspect is aimed at universal use. Can I take the slow-motion camera with me everywhere, or does it even fit in my pocket? Is it light or heavy? It may also be very large and bulky and may require an external power supply?


The list could be continued, but the listed characteristics are the most important criteria. You should definitely not be scared off if you've never heard some of these terms before. it's not as complicated as it sounds. However, some initial research might be helpful.