High Speed Camera Questions

High Speed Slow Motion High Speed Camera

6 replies to this topic

#1 Alexander Sutton Hough

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Posted 24 March 2017 - 01:02 PM

I need to film some items falling and want to slow it down so it takes 15-30sec to travel from top to bottom of frame at a play back speed of 23.976fps. Any recommendations of what frame rates I should film in and what what high speed camera I should rent?

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#2 Macks Fiiod

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Posted 25 March 2017 - 01:07 AM

Depends how high up the items fall from. Should also precisely count how many seconds the falling lasts to get in the mathematical ballpark of what you want.

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#3 Satsuki Murashige

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Posted 25 March 2017 - 01:22 AM

First, figure out how many seconds (X) it takes for each item to fall though your frame in real-time. Then divide your screen-time of 30 sec / X = F. That is the factor (F) by which you need to slow down the motion. Last, multiply F x your playback rate of 24fps to get your required frame rate.

For example, let's say it takes 2 sec for an apple to fall in real-time. 30 sec (screen-time) / 2 sec (real-time) = 15 (F). 24fps (playback rate) x 15 = 360fps. That's getting into Phantom territory for sure.
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#4 Michael Rodin

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Posted 25 March 2017 - 05:51 AM

And time of free fall in seconds is roughly 0.45 x square root of height in meters. It's physics, gt^2 = 2h

Several hundred fps can be shot on many 16/35mm cameras, and it might end up cheaper than a Phantom.

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#5 Macks Fiiod

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Posted 25 March 2017 - 01:18 PM

This camera could get some work done if renting a Phantom is out of your budget.

1000fps at 1080p

https://www.bhphotov..._4_digital.html

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#6 Satsuki Murashige

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Posted 25 March 2017 - 02:30 PM

I don't know about that particular Sony camera, but the budget slowmo camera Sony FS700 gets to higher framerates by line skipping and then eventually cropping. So it's really only useable up to 240fps. 480fps is quite soft and aliased, and 960fps is basically unusably soft. The newer cameras may have improved on this, but it's something to be aware of.

Here's an FS700 test I shot about four years ago: (starts @ 1:24).
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#7 Richard Perrine

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Posted 04 April 2017 - 10:40 PM

I've got a Fastex F4 16mm rotating prism camera from the mid 1950's or 60's.

I've never run it...got the camera with a bunch of other stuff I picked up and since it's low speed is 500 frames per second

I didn't think I would ever have to stop a bullet.....I think the top speed is some thing like 3000 frames. (would have to check the manual).

Cables and books are there on how to use it and calculate exposure.

Battery is not with the camera.....runs on something like 40Volts (another thing for me to check)

\$400.00 plus packing and shipping (it is in it's own case.....I have some pictures I could send you).

Located in Akron Ohio

E-mail   RBPerrine@att.net

Edited by Richard Perrine, 04 April 2017 - 10:48 PM.

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