DVrig Balancing...

Re: DVrig Balancing...

the reason it says to leave it on on a tripod is that it expects movement. no matter how still the dvrig is, it will never be perfectly still. try putting your dvx on a stable tripod, and move it around a bit with OIS on. then stop the movement completely. you should notice some strange drifting of the image, kind of like pan-and-scan dvds.

what OIS does is sacrifice the outside few pixels in order to give the image padding for movement. as the gyros (are there real gyros in it?) in the dvx sense movement, they compensate by shifting the recorded image a certain amount of pixels, thus keeping the image relatively in the same spot in the frame. that's why the image is never completely stable when you're shooting with OIS on. in order to be completely stable, you'd have to give up a LOT more than those outside few pixels.
 
Re: DVrig Balancing...

"..sacrifice the outside few pixels.."

I don't think this is the case with the DVX. The DVX lens has an optical image stabilization system with a separate element group that can move in the X and Y axes (the infamous clunk!). The camera is equipped with motion sensors that detect X and Y movement and process it into the angle and speed of movement. This information is processsed and is used to control the OIS element group to compensate for the movement.

A much inferior method is digital image stabilization which digitally magnifies the image (like a constant pan and scan) and throws away pixels to stabilize the image.
 
Re: DVrig Balancing...

yeah, i wasn't sure about that (the pixel thing) with the dvx, but i thought i'd try and sound smart anyways. still not completely sure, as i thought the optical stabilization simply took the guesswork out of the camera's hands, providing a more accurate amount of pixels to lose, although what you said does sound probable.

i would highly suggest people try the tripod/OIS thing to get some idea of what the camera stabilization is doing.
 
Re: DVrig Balancing...

from Panasonic:

"A gyrosensor detects handshake and sends signals to a linear motor, which adjusts the lens to compensate. This process takes place prior to the CCD image capture rather than in the downstream electronic processing, this minimizes any effect of handshake."

So yes, it happens before it becomes digital. Nothing lost. I stand corrected. Although I'm sitting, so I'll stop to get corrected next time I go to the fridge, ok?

sincelery carrots,
ecna
 
Re: DVrig Balancing...

yeah optical stabilization gives a much better and loseless effect than digital stabilization.

However, on a dolly or stedicam or Tripod, I strongly recommend turning OIS off, as it will try and compensate for your vertical movements. OIS puts more focus on up down rather than left and right because when you shake its usually up and down, and panning is usually intentional. On a rig, if your doing a movement on this vertical axis you will notice some wierd corrections when when you teeter on the Giro's threshold.
 
Re: DVrig Balancing...

Ecna what the hell is your Avatar a photo of?
 
Re: DVrig Balancing...

Heh.

It's a cross between the freemasons eye/pyramid thing and the teletubbies symbols. one of the endless logos for cryptopop, an art collective I'm involved in.

Bigger:
tubbymason.jpg
 
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