Tips/advice for shooting video with DSLR's.

Lost Canadian

Expedition Leader
Scott's thread was getting off topic so I'll fire up is thread so we can bring the chat about frame rates and all other pertinent information with respects to shooting video with HDSLR's here.

I'll start with the question I asked in the other thread. Given the option in frame rates, what are the general rules of thumb so to speak, and how does shutter speed work into the fps discussion?
 

ywen

Explorer
going back to the previous discussion of fps vs shutter speed. The rule of thumb is to keep the shutter speed at half the rate of the fps... or at least keep it as closely as possible..

1/48 for 24fps
1/60 for 30fps..

The idea here is that shutter speeds higher will result in strange stutter to the motion, and speeds lower will result in blurry/smeary motion (akin to low fresh rate LCDs)

So for photographers - think of it as shooting in shutter-priority mode. As a result, the only methods of controlling exposure is to vary the aperture, ISO, or use ND filter. Which is why ND filters are critical in shooting videos, especially if one wants to shoot with a large aperture. Think of shooting at ISO 100, f/1.8 @ 1/48 on a sunny day, it'll be tremendously over exposed... you'd need a strong ND filter to overcome all that light..

A more in depth explanation here:

http://www.digi1080p.com/tutorials/114-180-degree-shutter-learn-it-live-it-love-it.html
 
Last edited:

mtnbike28

Expedition Leader
Canon 5d Mark II

Was there an error here:???
going back to the previous discussion of fps vs shutter speed. The rule of thumb is to keep the shutter speed at half the rate of the fps... or at least keep it as closely as possible..

1/48 for 24fps
1/30 for 60fps..

Should it be 1/12 for 24fps?

On the Canon 5d Mark II with the firmware upgrade, it shoots at a true 29.97 fps, so the best shutter is 1/15?

Thanks
 

ywen

Explorer
well 1/24 is same as 24fps

1/48 is half the speed of 1/24

However on the canon DSLR, the closest you can get is 1/50..

The 5D2 shoots at 29.97 (30P) or 23.97(24P)...

i meant to say 1/60 for 30p in my above post...
 

Paladin

Banned
That's a great example shot at that link. Cool, never even thought this is an issue. I wonder what my camcorder is doing...

As I said in the other post, I think that the purpose of the footage is important to the discussion.

24fps for that "cinema look" (which frankly, I don't really understand, I'll have to pay more attention).

30fps Progressive for internet video, as this is what most upload sites accept, and most monitors, will work best at.

60fps Interlaced for viewing on TV and/or intended for broadcast. This will look smoother than 30p while using the same amount of space, and taking up half the memory of 60p. 60i doesn't display well on a computer monitor.

I wonder what is the technical reason why a DSLR capable of shooting 30p doesn't offer the option of 60i. And a camcorder capable of 60i doesn't offer the option of 30p. I'd think the data throughput is similar so... why not? I can only imagine the reason is in the CMOS chip. A CMOS is very much like a little computer right on the chip, doing a lot of processing right onboard. That contrasts to a CCD chip which is a much simpler device where ALL processing is done in another processor. I'd guess the CMOS sensors are specialized for the task they are intended. The DSLR CMOS chip is set up for progressive, since that's how photos are done. A camcorder CMOS is set up for interlaced, since they are intended for TV display (or were, I think that's changing). You'll notice the less expensive camcorders (Sony Bloggie, Flip, etc.) all shoot progressive. They know that customer is intending to display on a computer.
 

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