[Marta Breijo]

Ok this worked for me. I obviously touched something I shouldn’t 😛

[Marta Breijo]

Well, any kind of movement with a CMOS sensor camera may cause problems, but most things you can fix with some post-prod tweaking. I use AE, which is got some very good tools; and there are also some amazing plug-ins out there that will do almost anything.

But there is one thing I’m always concerned about, and it’s the judder/stutter/jitter problem (it’s got many names haha). It’s easier to show it than to explain it: https://vimeo.com/36311909 That choppiness is something many of us struggle with when using DSRL for video, even when respecting the “xFPS + 2xShutter” (what’s the name?) rule. I do not know in depth the reason why it happens, but it happens a lot. And the worst is… there is still no plug-in and no tool to fix it. You can smooth it a little with motion blur, and try different fps redering but no real fix for digital video (it appears that it gets fixed with interlaced rendering, but ofc, interlaced will only have a nice look for TV, but not PC monitors and such :S).

And so that would be the only problem I would be concerned about. Mainly because you are going to record a music video, and that sounds like a lot of movement. Be careful with fast pans, and give special love to hand held camera shots. For me, this article shed some good light on the problem: https://kb2.adobe.com/community/publishing/908/cpsid_90843.html It has some really good advice on how to avoid that horrible effect.

In general, you can use tripods, dollys, and any support method you feel that will give your project the best look, none of that should cause problems. Also, you can add extra slow motion with a plug-in called Twixtor. Sometimes I shot at 30 or 25 fps, and after the post production my boss came in and asked to heavily slow down something… that plug in saved my life haha It does an amazing job. However if you plan to slow down even more (more than the final 24 fps), you will see you start getting that judder effect. That is essentially because your editing software will start “making up” the frames it doesn’t have to fill the gaps, and that means duplicating the ones it does have, which ends up in… judder! (ugghh). That’s why I said before it’s better to shoot at the maximum fps you can, so you get the fastest fps, and then if you need to get rid of some frames it’s always easier than “making them up” (gee, I hope I’m not getting you confused!).

Oh and.. you probably already know this but just in case, if you happen to need stabilizing and/or removing rolling shutter problems, all in post-production, AE (from 5.5 on) has the Warp Stabilizer tool. Since you are going to use a 7D (I have the same camera btw) you might encounter some rolling shutter at some point.

I hope this helps, cheers!

Marta

[Marta Breijo]

Hi Scott,

I was wondering right now about the combinations of shutter-fps-movement speed I can record without getting a horrible judder effect (and any other shutter problems). I’ll look for a combination table, or make one some day. To be honest, I’m not sure how much of that would affect a slowed footage. I’d go for a trial-and-error method before the day you shoot… even if it’s only to make sure the camera and movements you will use have an opportunity to work fine in the end.

That being said, I do have an answer for your question about 60fps at 1/125 shutter. There are mechanical limitations for 60fps being shuttered under 1/125th. So I think 1/125 should be fine for 60fps… at least that’s the combination usually chosen for 60fps.

My advice in any case is… avoid moving too fast with your camera (probably the “7 second rule” will help), record at the highest fps you can, and use a tripod or some support to make your picture the stablest you can. Those will avoid post-production nasty fixes.

As to the difference between 50 and 60 fps… well, 60fps rendered into 24fps will do as slow mo, but 50… it’s basically just double the real speed. I’d go for 60, not only for more slow mo effect, but also because the more “picture info” you get, the better. You can get rid of anything you don’t want later… but to make sure you get all you need, just in case I’d go for 60.

There is a good article I read some time ago about shutter speeds you might find useful, even if it’s only to understand the reasons behind the shutter speed choices: https://www.mikemccormac.com/news/tips-and-advice/item/619-whats-the-right-shutter-speed-to-shoot-video?.html

Cheers,

Marta