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video jello

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Paul Shields said:
phauksson said:
Canon 5DII does have jello vision like the D90, sorry to burst your
bubble guys.

Watch this http://vimeo.com/1815853

Lafortes footage was stable because he compensated for it with gyros
and rigs.
Click to expand...
And how many movies have you seen where the camera operator swings
the camera around in such a violent fashion? Maybe it will prevent
any more Blair Witch derivatives, but for those who know what they're
doing (and also use gyros - pretty standard stuff in flim making) I
doubt if it will be the deal breaker.
Click to expand...
I discovered another flaw with the 5DII video that no one has mentioned. I carfully put the camera in record mode, then tossed it from a balcony on the forth floor. After 3-seconds the video looked like garbage. How can anyone expect decent home movies with this limitation?!

(I mentioned the forth floor so Victor could accurately correct the timing based on the gravitational pull and distance) :)

Sal
 
Jell-O was the clincher. I'm definitely getting a 5D/2 now.

Does Canon sell refills for it, or do you have to make your own and stuff it into the camera?

Brendan
=====
I am the last sane person on earth.
 
Sal Baker said:
I discovered another flaw with the 5DII video that no one has
mentioned. I carfully put the camera in record mode, then tossed it
from a balcony on the forth floor. After 3-seconds the video looked
like garbage. How can anyone expect decent home movies with this
limitation?!

(I mentioned the forth floor so Victor could accurately correct the
timing based on the gravitational pull and distance) :)
Click to expand...
What's to correct? Assuming the floors are 10 feet each, it will take just over 1 second to reach the ground (assuming gravity accelerates the camera 32 feet/second each second), at which time, evidently, the lens will have broken, rendering the video clip garbage-like. Assuming the camera still functions, the broken glass may make for some interesting effects, though.

Or maybe the camera had a soft landing in the dumpster (we do know from movies that garbage produces soft landings).

--
http://www.pbase.com/victorengel/

 
Scott Larson said:
Its RKM said:
There is no reason why CMOS sensors cannot be designed to have a
similar "snapshot" mode of operation as CCDs and, indeed, many do.
Click to expand...
Do you need a snapshot mode or do you just need a fast enough rolling
shutter to minimize the effect?
Click to expand...
Snapshot eliminates the problem. A faster rolling readout reduces it.
Scott Larson said:
Don't film movie cameras still use very fast mechanical rolling
shutters?
Click to expand...
They can be fairly fast, but not always. Film cameras have disc shutters that rotate 360deg per frame and, typically, 180deg is open, hence the shutter speed is usually twice the frame rate, ie. 1/48th of a second. The film advances during the time the closed segment passes the gate. The shutter "roll time" depends on the ratio of the height of the frame to the radius of the disc - a larger shutter will have a faster roll. This is one of the compromises made to get small film cameras.

--
Its RKM
 
Its RKM said:
The shutter "roll time" depends on the ratio of the
height of the frame to the radius of the disc - a larger shutter will
have a faster roll. This is one of the compromises made to get small
film cameras.
Click to expand...
In other words the larger the disc, the faster the edges of the shutter can travel over the frame with the same shutter angle/speed. Since it's always a finite speed (unlike CCDs) it seems that with CMOS or other non-snapshot sensors it's just a matter of getting the roll to happen as fast as these film cameras.
 
Shinjuku is my favorite place on the planet and I go as often as I can. Would you please be so kind to tell me where the Canon showroom can be found there. thank you in advance.
 
when you walk towards the tokyo metropolitan offices (the twin tower by Kenzo Tange) after exiting the subway at shinjuku station (staying for a while still in the underground passage), it is on the right hand side of the street. 5 minutes after getting out of the subway you are there.

btw, i checked out nikon's D90 yesterday and it became clear that it produces more jello

(triggered much more easily) than the 5D mark II. THIS IS NOT A DIRECT COMPARISM, just an observation. and, yes, among other systems like hasselblad+P45+A75 and Alpa, i do shoot nikon. but i might buy a 5D mark II for the video fun of it. my problem with canon is not the cameras, it is the wide angle lenses.
peter
 
I think I've passed the Canon showroom, more or less across from the Keio Plaza Hotel before you reach the twin towers. But I may be mistaking it with the one in Osaka, thank you, I will find it on my next trip.
 
hmm i don't see it very badly at all
maybe you re more sensitive to it

i do see it much moreso in the other one, but the other one was mostly doing ridiculous things, although i'm sure it could creep in to some degree with regular stuff.
seems to me like it will be just good enough to not be a major issue though
fooddude said:
bronxbombers said:
fooddude said:
here a new video sample i found that has lots of jello too :(

http://www.flickr.com/photos/novellsteel/2894471636/
Click to expand...
Click to expand...
fooddude said:
-are you confusin
Click to expand...
he was trying pretty hard to hold the 5dii steady judging by the slow
panning, and it still showed jello similar to this:

http://vimeo.com/813505
Click to expand...
 
Scott Larson said:
Its RKM said:
The shutter "roll time" depends on the ratio of the
height of the frame to the radius of the disc - a larger shutter will
have a faster roll. This is one of the compromises made to get small
film cameras.
Click to expand...
In other words the larger the disc, the faster the edges of the
shutter can travel over the frame with the same shutter angle/speed.
Since it's always a finite speed (unlike CCDs) it seems that with
CMOS or other non-snapshot sensors it's just a matter of getting the
roll to happen as fast as these film cameras.
Click to expand...
Correct, however that "just" is a somewhat larger obstacle than it appears.

The roll rate is determined by how fast data can be read off the sensor. At 30fps, the 2Mp 1080p format corresponds to at least 60Mp/s. This assumes that Canon only read the required 2Mp Bayer pixels for the HD video, ignoring all others.

However, they probably do some kind of binning similar to sRAW, with each sample being a true RGB pixel, making that entire data rate 180Msamples/sec.

That is quite a speed already without trying to increase it further "just" to reduce the roll time. ;-)
--
Its RKM
 
Vincent's video may or may not be the best piece of story telling, but the quality of the images is incredible. Few here will ever produce such well-crafted video shots because of endless excuses:
You must have 30 lenses or none of the lenses will work well.

You must have 20 assistants just out of the camera's frame or the CMOS will render crumby video.

The video circuitry will not work unless the shots are composed by a talented person.
High-quality 30fps video is impossible to capture without a gyro car mount.

No one has ever achieved decent video results without the aid of a helicopter.

Now you can all relax, you don't even have to try, 1080p video clips are a joke without nauseating shaky pans.

Vincent's video shows that as a worse case scenario, one may be required to use good judgment and work within the limitations of the tools.
Patient: It hurts when I do this!

Doctor: Don't do that!

Sal
 
Its RKM said:
That is quite a speed already without trying to increase it further
"just" to reduce the roll time. ;-)
Click to expand...
Yeah, once you look at the data rates needed to pass raw HD video, it becomes clear that you need serious dedicated hardware just to be able to do it at all, even with CCD sensors. :-(
 
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