Canon 7D - stuttering/"Private Ryan" look

O

Omar67

Active member
Hello,

I have seen many video tests of the Canon 7D 1080/24p look. Many of the tests look quite "strobey" or stuttering like "Saving Private
Ryan" Look. Is this an issue with the camera? Does this need to be smoothed out in post? What is the recommended Shutter angle (like the Panasonic does it have the option to be 1/48th?) Does it still have that stutter look? Are some of these just issues with the card? Is it actually 23.98 when you edit in AVID/FINAL CUT etc. or is it another format completely.

I want to run some tests next weekend, and i am looking for any advice on the above questions.

Thanx - hope everyone is having a Happy Thanksgiving as well.
:)
Omar
 
The closest to 1/48 on this camera is 1/50, which is close enough. The "strobey" footage you're seeing is shot at something other than that. Kept there, the footage looks fine.
 
Thanx i will give that a shot annnnnd any suggetions on post. Is this a 1080p/23.98 project? How would one output to a 29.976 DVD? I know how to do this with p2 etc., what type of file or third party software would i have to purchase with my editing system (AVID) to do this?
 
If you shoot in daylight, even with 100 ISO, it's usually too much light. Since some users don't have ND filters available, they compensate by either stopping down to a higher aperture or increasing the shutter speed to cut the light. The advantage of the higher aperture is being able to keep the 1/50 shutter for a more natural motion blur. The advantage of the higher shutter speed is keeping the low aperture in order to maintain a shallow DOF.
 
Beeblebrox said:
If you shoot in daylight, even with 100 ISO, it's usually too much light. Since some users don't have ND filters available, they compensate by either stopping down to a higher aperture or increasing the shutter speed to cut the light. The advantage of the higher aperture is being able to keep the 1/50 shutter for a more natural motion blur. The advantage of the higher shutter speed is keeping the low aperture in order to maintain a shallow DOF.
Click to expand...


And also, a high shutter is needed for slowing down footage beyond 40%, at least if you want it to look natural.
 
cheezweezl said:
not true...
Click to expand...

Yes, it is. You see, the 7D shoots at 60p, pulling it to 24p will yield roughly 40% of the original clip while still retaining a fluid natural motion. Slowing it down beyond that using built-in speed modifiers will give it a jittery and distracting effect as these programs achieve slower speeds by "cheating" and simply doubling select frames, which is what gives it this artificial look.

So, in order to achieve further slow motion you'll need a third party plug-in (such as Twixtor) that uses algorithms to generate frames based on the previous frame. That way you'll have genuine frames, making your slow-motion look natural, sans the jittery doubled frames.

Now in order for a plug-in like Twixtor to properly do it's job, the sharper the image the better, which the higher shutter will give you.

See what I mean?
 
RED is stuttery too compared to film , i guess it have something to do with rolling shutter ,but i have canon camcorder and tried 25p on it and 25 on 7D , on camcorder its not so stuttery as on 7D.Camcorder have CCD sensor.And yes , i changed shutter speeds.
 
TheDynamoDuo said:
Now in order for a plug-in like Twixtor to properly do it's job, the sharper the image the better, which the higher shutter will give you.
Click to expand...

mmm. No. The sharper the image, the more artifacts twixtor will give you. If you have a good amount of blur, twixtor will have an easier job and less artifacts.
 
Cinema Film cameras have a rotating or spinning shutter that is generally set to 180 or 170 degrees, depending on the camera. This means the film is exposed to light 50% of the time, and moving through the camera body in darkness 50% of the time.

To match this "natural" look, set your shutter speed to half of your frame rate.
60FPS= 1/125th of a second.
24/25FPS= 1/50th of a second.

The Private Ryan look has less motion blur than the "natural" look. It is acheived with a shorter exposure time/faster shutter speed. I believe they used a 90 degree shutter on Private Ryan which would be 1/100th of a second on the 7D at 24/25FPS.

Blurrier looks can be acheived by leaving the shutter open longer, this can create interesting effects too. Choosing 1/25th of a second, at 24/25FPS definitely gives a different look.

If you are seeing stroby footage from the 7D, it's possible that the shooter intentionally, or unintentionally had his frame rate set to something other than the 180 degree "natural" motion blur setting.

Cheers!
 
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