Major noise issues at slow fps and open shutter. Rainbow dust...

[Jarek Zabczynski]

I'm doing tests for timelapse shooting and and seeing big problems. I've never seen this before.

When shooting at 5k, 1fps with my shutter at 360 I get horrible noise or artifacts.

They are all static and move with the image as if it was dust on a lens.

Did a quick snap shot so you can see it. Anyone know what's going on here?

Also, full rez.

http://www.jesterpictures.com/red/A009_C003_0526CU.00000085k.jpg

 

[Joseph Coleman]

Blackshade at current FPS/Shutter should clear it up.

 

[Patrick Tresch]

Is this after you performed blackshading?

Pat

 

[Jarek Zabczynski]

Yes. I've tried blackshading. Though I don't think it allowed me to at 1fps. Had to bump up to 8 or 12fps and did it from there. Will look again.

 

[Scott Snare]

Might be blue channel noise, no blue in low light situations can cause noise. Balance for 5000, low light tungsten will starve the blue channel.

 

[Mike P.]

Might be blue channel noise, no blue in low light situations can cause noise. Balance for 5000, low light tungsten will starve the blue channel.

It looks like there are just as many red and green pixels as well as blue ones (although the blue might be exacerbated because their being amplified more at the lower Kelvin settings.)

At regular motion frame rates is this noticeable? As in, does a single frame at 24fps with 360deg shutter exhibit the same behaviour?

It looks very much like high-ISO noise, even though it isn't. The reason it doesn't move (looks like dust on a lens) is because those pixels aren't moving (presumably for an entire second at 1fps); in other words, there isn't enough motion to mask those momentarily hot pixels. If it isn't noticeable on individual frames for regular speed footage then I bet this is a blackshade issue that isn't resolving because the camera isn't allowing you to do it at 1fps.

 

[TheBied]

Yes. I've tried blackshading. Though I don't think it allowed me to at 1fps. Had to bump up to 8 or 12fps and did it from there. Will look again.

Set your frame-rate to 1 fps, and shutter speed to 1s. Then run black shading (at current FPS/exposure). You'll need to be on build 3.0.7 or later.

The noise you are seeing is due to the calibration not matching the longer exposure time.

If you switch back to a shorter exposure time, you'll want to re-black shade or switch back to the factory default calibration.

 

[Jarek Zabczynski]

Yeah, I've never seen this at normal framerates. Managed to start a blackshade at these settings somehow. Will see what happens. Screen is super noisy in the process. Here's a pic from my iphone.

 

[Jarek Zabczynski]

Set your frame-rate to 1 fps, and shutter speed to 1s. Then run black shading (at current FPS/exposure). You'll need to be on build 3.0.7 or later.

The noise you are seeing is due to the calibration not matching the longer exposure time.

If you switch back to a shorter exposure time, you'll want to re-black shade or switch back to the factory default calibration.

Ah ok. I haven't upgraded my firmware since I got the cam in Jan. It's been working so well I was afraid. Will have to give that a go. Do I need to upgrade builds one at a time or can I just go with the latest one?

Thanks!

 

[TheBied]

Ah ok. I haven't upgraded my firmware since I got the cam in Jan. It's been working so well I was afraid. Will have to give that a go. Do I need to upgrade builds one at a time or can I just go with the latest one?

Thanks!

There was an issue fixed after 3.0.0 which prevented the camera from calibrating at many non-default exposure times. 3.0.7 is the current release version, and 3.2.13 is the current beta version. You can upgrade to either version directly, but the smaller more incremental upgrade is to use 3.0.7.

 

[Jarek Zabczynski]

Thanks Matt, will try that next.

 

[Jarek Zabczynski]

Well, proper black shade on new firmware seems to have done the trick! Had my first RED heart attack moment for a sec!

Thanks guys!

 

[Andy Maser]

What's the proper way to blackshade if you plan to shoot at different frame rates/shutter speeds/resolution settings throughout the day? Is a default blackshade before the shoot day starts the best way to go?