Considering slow motion

R

Ruel

New member
Maybe this question have been asked and answered before.

What are the things to be considered when shooting with the DVX if I intend to do slow motion (as much as 30%)?

Shutter speeds? Interlaced or progressive mode? 24P, 30P, 60i? Pulldown?

Any thoughts would be of help. Thanks.
 
Re: Considering slow motion

The main thing to keep in mind is how much you intend to slow it down. Slowing by 30% is almost guaranteed to give awful results. You want to stick to specific increments, usually 50% or some other increment that gives you a 1-for-1 relationship.

For the ultimate clean, mild slow motion in a project, shoot your main project in 24P and shoot your slow-mo shots in 30P. Read the article in this month's Studio Monthly magazine for details.

For the best in slow slow motion, do as BlueSpider says and shoot 60i, then bring it into your project and slow it down to 40% speed. That'll make one frame out of each field and give you a clean (but lower resolution) slow motion effect.
 
Re: Considering slow motion

This is only one of the many things explained very well in the DVX Book/DVD. Well worth the price if you are fairly new to the DVX.
 
Re: Considering slow motion

hmmm... and what are the best setting for PAL-User?

(I know there was a thread about it but I can't find it :-/ )
 
Re: Considering slow motion

For PAL, it's a little more limited, because you don't have the intermediary 30P frame rate to choose from. So the answer is also much, much simpler: shoot 50i at 1/100 shutter speed, and play back at 50% speed in a 25p timeline. Each field will be turned into a frame, giving a motion-perfect 50% slow-mo.
 
Re: Considering slow motion

This Forum is like a encyclopaedia!
- Thanks Barry and disjecta -
 
Re: Considering slow motion

No, it's more like the Bible!

Thou shalt do as I command and salvation shall await thy soul!
 
Re: Considering slow motion

do you need to deinterlace if the project was going out to film. That is if you shot in 60i and slowed down to 40 or 50 percent
 
Re: Considering slow motion

The editing program will take care of any de-interlacing needs, regardless of whether going to film or not.

Using Vegas, it creates one 24P frame out of each field of video, by de-interlacing one field from each 60i "frame".
 
Re: Considering slow motion

[quote author=Barry_Green link=board=Events;num=1104895213;start=0#5 date=01/05/05 at 12:46:10]For PAL, it's a little more limited, because you don't have the intermediary 30P frame rate to choose from.  So the answer is also much, much simpler: shoot 50i at 1/100 shutter speed, and play back at 50% speed in a 25p timeline.  Each field will be turned into a frame, giving a motion-perfect 50% slow-mo.[/quote]

Is it possible to still retain the "film" look doing this, or would I have to try and make the 50i look like 25P in post?
 
Re: Considering slow motion

By slowing the 50i down to 50% speed, it *becomes* 25p. Well, not really, because it's lower in vertical resolution, but the motion rendition is identical to film shot at 50fps and played back at 25fps.
 
Re: Considering slow motion

Thanks Barry.

So it would just be a case of keeping my scene settings the same, and turning 25P off in the camera; then in post the shots should look the same?
 
Re: Considering slow motion

That is exactly what I'd recommend. Use exactly the same scene file settings in all ways, and the only difference would be whether you were shooting in PROGRESSIVE: 25P or PROGRESSIVE: OFF. That'll keep the look as similar as possible.

The other thing you want to do is use a shutter speed of 1/100 for your 50i-for-slowmo stuff. That'll give the crisper film-style motion rendition, and also compensate for the exposure difference between 25p and 50i.
 
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