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slow motion shooting fps with DSLR
show user profile  9krausec
Hey everyone! For my films class I need to shoot a short that my group and I have planned to do part of in slow motion..

We were going to shoot 24fps to have more of a film look, but I wanted to ask if any special steps need to be taken to slow some of the shots down in post..

I don't know if due to the slow motion aspect of some scenes, if more fps need to be used to make thing look better or not..

Any advice is always appreciated. Thanks!

- Portfolio-

read 576 times
11/16/2011 5:03:51 AM (last edit: 11/16/2011 5:03:51 AM)
show user profile  Bolteon
you can slow down stuff in post all you want but it'll never look as good as actual slow motion footage.

slo mo is just higher shot fps (120, 240, etc) being played back at 24fps thus giving the effect of slow motion.

you can do it in post but the artifacts depending on what your filming and with what can be pretty bad; currently the best solution i've seen is twixtor.

-Marko Mandaric

read 567 times
11/16/2011 6:57:50 AM (last edit: 11/16/2011 7:09:37 AM)
show user profile  nm8r

Remember to use 1/125 shutter speed when shooting 60p and 1/50 when shooting 24p .
read 557 times
11/16/2011 9:39:34 AM (last edit: 11/16/2011 10:41:35 AM)
show user profile  9krausec
Thanks for all the help everyone!

Sadly, my t3i (should of got the d60 or higher, really regretting that now) can only shoot a max fps of 30...

Now, I am totally new to the DSLR... Is there any way at all that I can increase the fps to more than 30?

I don't think I can with the stock firmware installed on the camera, but what is physically (hardware wise), holding the camera back from actually shooting at a higher frame rate?

At risk of sounding like a total butt, has anyone ever came out with firmware hacks for dslr cameras to not be limited by the factory firmwares settings?

I just don't understand why the camera wouldn't be able to shoot at a higher frame rate..


edit: and when I say max 30fps I mean at highest resolution.. I don't know enough about cameras, so don't be too harsh.. :) and I found magic lantern, but it isn't out for the t3i yet..

- Portfolio-

read 517 times
11/20/2011 6:18:06 AM (last edit: 11/20/2011 6:41:42 AM)
show user profile  reeves1984
Shooting more fps, think about it, is literally being able to process more frames - and usually you're asking for 2x as many the camera's that don't have that just can't cope - and when they can usually it means in a smaller resolution.

So if you forced a camera to do more fps somehow, it'd probably drop frames etc.

Simon Reeves - VFX Artist & Blog
twitter <-- I work here

read 495 times
11/20/2011 12:03:04 PM (last edit: 11/20/2011 12:03:04 PM)
show user profile  9krausec
Yeah. That makes sense..

I was looking at twixtor more indepth, and it doesn't seem to cost all that much. I might just drop the money and get it (express version)...

It seems to handle well with working at 60 fps on a 720 res video.. Unless there would be another, cheaper option.

Seems like a lot to drop just for one film project, but I know I will be using it again.

better than spending even more on a more expensive camera than the t3i (can't afford that for another 5 years).

- Portfolio-

read 493 times
11/20/2011 12:24:34 PM (last edit: 11/20/2011 12:28:09 PM)
show user profile  nm8r
Your camera can shoot 60fps at 720p -which is the same as the higher end 7D. Even my 5D Mark II can't shoot 60fps.
read 482 times
11/20/2011 2:09:56 PM (last edit: 11/20/2011 2:24:56 PM)
show user profile  nm8r
9k - what's your email address?
read 468 times
11/20/2011 3:53:35 PM (last edit: 11/20/2011 3:53:35 PM)
show user profile  killerbee2
good post slomo really depends on the shot. I've been able to do interpolations of 20-30 frames inbetween 2 frames, on other shots you can't even do 1.

What to watch when shooting :

- avoid fine detail like hair, small tree branches, liquids
- no occluding object movement (like a hand passing in front of a head)
- use a high fstop, narrow dof will give artefacts on fast movements.

read 458 times
11/20/2011 6:33:18 PM (last edit: 11/20/2011 6:33:18 PM)
show user profile  9krausec
alright KB, thanks for the advice, especially the high fstop.

we do have a shot planned out with a girl on a swing set slowed way down. So there will be hair :/

@nm8r- 9krausec AT gmail DOT com

- Portfolio-

read 448 times
11/20/2011 7:28:31 PM (last edit: 11/20/2011 7:28:31 PM)
show user profile  killerbee2
that's gonna be tricky... if you'd shoot her in front I think it'll be ok, if you shoot her sideways or 45° it'll get ugly. Do shoot at 30fps even if you go 24/25p afterwards, that'll give you allready some extra frames when interpreted as 24/25.

read 428 times
11/20/2011 10:41:40 PM (last edit: 11/20/2011 10:42:37 PM)
show user profile  nm8r
Yeah. You can push it with Twixtor but everything has its limitations. Check your email
read 424 times
11/20/2011 10:53:06 PM (last edit: 11/20/2011 10:53:06 PM)
show user profile  9krausec
Thanks for the information nm8r!

Also, just wanted to share that I just installed magic lantern on the t3i..

Now that I am able to change the iso the multiples of 160, I have been able to reduce the noise a LOT.

Great bit of firmware for anyone looking for more options..

- Portfolio-

read 404 times
11/21/2011 2:15:49 AM (last edit: 11/21/2011 2:15:49 AM)
show user profile  Bobbyboy
Yea, as other have already said twixtor is probably the best bet for you, I have used it and it can be very good depending on the footage.

I would shoot at 720p 60fps and upscale the footage in post

@bolts, have you tried the foundry's Kronos? come packaged with nukex I think, seems to be better than twixtor though I haven't had much of a chance to play around with it.

read 402 times
11/21/2011 2:55:40 AM (last edit: 11/21/2011 2:55:40 AM)
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