Canon 5D 1080i footage: pixellated and noisy?

evolvnyc

evolvnyc

Well-known member
We're shooting at iso 100 in 1080 video with the 5d on a well lit set with a gray backdrop, the footage is very splochy looking on the background almost as if there is lots of gain on it. Has this happened to anyone? I also noticed that if I blow it up to 110% it is much worse. Is there any setting that could be effecting this? Everyone says this footage is of the highest quality but my HVX and even DVX looks far smoother.
 
try 160 ISO it's less noisy than 100 and turn highlight tone priority on it seems to help with blocks of grey. The slightest bit of underexposure will bring on nasty compression artifacts.
 
Interesting, testing that out now. Also we just noticed that the shutter speed setting on the 5D effects the exposure, but how can this be? Isn't it 30 fps no matter what? we had the shutter at 1/40 could this be causing our problems? Thanks!
 
Shutter speed is how long the shutter is open for, the frame rate is how many times it opens in a second.

Iti is my experiecnce from still photography that grey backgrounds test any digital recording device to the limit because they have subtle changes of tone which look really bad undercompression which saves file size by making approximations, and those show up as bands in the tone changes

Blue skies are a challenge too

How any of the above mentioned devices perform under those conditions I could not comment

S
 
You want to keep the shutter speed at 1/60th the vast majority of the time.

Squig - do you leave highlight tone priority on all the time? Or just for low light shots?

Also what is with the iso thing? Is there an article on that and what iso's to use? for example if it is darker, I want to know if 1250 is better than 1200 or whatever the one below it is.
 
From my reading: ISO 160, 320, 640, 2500 and 3200 are good ISOs to use on the 5DII. Pick one of those ISO's and select a shutter speed of 1/60th of second.
 
f64manray said:
From my reading: ISO 160, 320, 640, 2500 and 3200 are good ISOs to use on the 5DII. Pick one of those ISO's and select a shutter speed of 1/60th of second.
Click to expand...
As Emanuel pointed out, 1/50th of second for PAL shooters. Why not ISO 1250?
 
f64manray said:
From my reading: ISO 160, 320, 640, 2500 and 3200 are good ISOs to use on the 5DII. Pick one of those ISO's and select a shutter speed of 1/60th of second.
Click to expand...

yeah testing has shown these are the lowest noise ISO's

As for highlight tone priority personally I've only just begun to test it. There are conflicting reports about it's effectiveness, there's a couple of threads @ cinema5D about this.

The biggest cause of noise I've found is compression noise/artifacts due to underexposure
 
HUH!!!!!!!!!!?!?!?!??!!?

ive been going crazy thiking my camera was defective!

this weird stationary grain apprears in vertical bands at what i thought was random times... perhaps its my choice of ISO's....... HUH...... interesting gonna test...
 
It may also be because you are shooting at 1/40sec. Are there multiple light sources involved? Tungsten or flourescent? I have found that at this shutterspeed they rear their ugly head.
 
Test highlight tone priority before you simply switch it on. Using htp greatly increases compression noise in the image.

Also - compression artifacts in underexposed areas are color specific. I have found it strongest in the reds. For example wood floors/walls/desks that are underexposed tend to cause problems. I find that the camera handles underexposure incredibly well. In some circumstances I find it to do better than RED.
 
You must log in or register to reply here.
Back
Top