how to create the perfect slow motion?

B

bigshinyspoon

Active member
hi
i'm filming soon and i would like to know how to achive the best slow motion. i have the dvx100b 24p . i'll use the letus 35 with the 24pa. do i need to shoot it in 48 shutter speed or i put it at 500 something like that? i need information please thank you
 
Either search here or take a look at Barry Green's book. Barry gives the step by step directions for slow mo and other stuff. If you search here I think you'll also find what you're looking for. It seems to be a frequent question. Good luck.
 
For ABSOLUTE perfect slow mo, shoot a shutter speed of 1/12, iris at f16, and master ped -15, nd filter of 1/8, and 24pA...this is at night of course, in the dark.





no no no im kidding -shoot 60i, with a shutter of 1/120, or 1/500 if you can get away with that
 
Alas! A Perfect Slow Motion is just not possible in DVX100 series ... :-(

But you may talk about a reasonable Slow Motion ...

Barry suggests doing Slow Motion in interlace mode with higher shutter speeds like 1/100+ and cut-down project speed in NLE ...

I would say interlace (50i/60i) mode has a better shutter speed span ... Coz the CCD won't have to capture the whole-frame instead a half frame(field) is captured at any time i.e. Camera would have 100% more time (to process frames) in interlace mode than in Progressive (24P/25P/30P) mode.


Effect of high shutter speed on FPS requires a drill down thinking:

There are two types of FPS: Capturing-Time FPS and Playback-Time FPS

Capturing-Time FPS:
Here Shutter Speed is directly related to captured FPS in Film/Digital Cameras. In other words Shutter Speed dictates the capturing/recording speed of a camera. Directly proportion means 1 shutter per second corresponds to exactly 1 captured frame per second and so on and so forth. If one wants to speed up the rolling(speed of camera), shutter speed would be increased and vice versa. So, to get X% Slow Motion, shutter speed would be set X% faster and to get X% Fast Motion, shutter speed would be set X% slower. This is also known as Under-crank(fastmo) and over-crank(slowmo). I call it 'Bad-Child' :D as the FPS varies.

Playback-Time FPS:
Here Shutter Speed has nothing to do any job at all what so ever. The playback FPS for Film(24FPS) and Digital(25FPS/30FPS) are constants. No matter how fast/slow Capturing FPS was, it would go like a Good-Child i.e. with the specified FPS.

By the way do correct me if I'm wrong !!!

Any suggestions ...
 
Your shutter speed doesn't dictate how many FPS your cam is running at. Your FPS setting dictates how any FPS your cam is running at. Shutter speed does have an effect on the look and obviously exposure of what you are shooting. Having a shutter below your frame rate (e.g. 1/6th with the cam running at 24fps) it gets wonky, but I believe Barry goes over that in the book.
 
If you'll be editing with Final Cut Pro, consider the Final Cut Studio upgrade that lets you do retiming effects.... both Motion and Compressor let you "retime" footage using Optical Flow instead of Frame Blending modes which is why most slow-mo footage looks like crap... check out their tutorial:

http://www.apple.com/finalcutstudio/motion/

and click on "retiming behaviors"

If you shoot with a high shutter speed, it will give you footage with high detail per frame although it won't change the frame rate you're shooting... then in FCS, you can retime your footage to slow it down 50%... and FCS will create entirely new frames... so it will look at frame A and frame B then insert a new frame between them... normally with most NLE's they would use a blend of frame A and frame B, but with FCS it creates an actual new frame based on what frame A and B contain... so no blur...
 
I have a client who has requested the following:

Videotape a 20 lb lead ball dropping down onto a thin piece of copper clad sheet material. They want to show how the ball causes less damage than if dropping the ball onto regular copper materials.

I was wondering if I could accomplish this in my studio with my Canon A-1 perhaps shooting in 60i at a fast shutter speed. (note, I have substantial lights in the studio and can throw lots of light onto the subject)

The other option is to rent a high speed video camera but I would like to try to avoid this. Any ideas on this dilemma?
 
You must log in or register to reply here.
Back
Top