Do i need to do black shading after each upgrade?

[TheBied]

I'll post a sample r3d when I get a chance... that will serve as a better example.

 

[Gavin Greenwalt]

Do I need to black shade when switching between 5k/4k or can I store a blackshade for each?

 

[TheBied]

Do I need to black shade when switching between 5k/4k or can I store a blackshade for each?

You do not need to black shade when changing formats.

 

[Ryan B]

I'll post a sample r3d when I get a chance... that will serve as a better example.

Would like to see that Matt..!

 

[Trevor Meeks]

It's been a while since I've done this but do I have to have a lens on to do this properly?

No, in fact it's best to have a body cap on the camera, and have the camera in a dark room and/or covered to prevent any light or infrared contamination.

 

[Trevor Meeks]

You do not need to black shade when changing formats.

Interesting. I was doing some low-light testing and switched from 4K to 5K, which resulted in horrible noise showing up, histograms were all whacked out.... I black shaded and everything went back to normal. This was on 2.0.8 a couple of weeks ago.

 

[TheBied]

Here's an extreme before and after example: https://docs.google.com/file/d/0B0hSNsjVi3ssdnpsMEIzMUtUNEdTcTlkeTRRazNTQQ/edit?pli=1

The after R3D is representative of the shading you should see if your camera is properly calibrated for it's current conditions.

Note: ISO is set to 12800 to exaggerate the noise in the image.

 

[Paramon Ivanovich]

Thanks Matt!

 

[Zeb B]

Thanks Matt,
How about posting a sticky official document on all things Black Shading: when, how, why, issues, examples . . . everything there is to know on the subject. This would be very helpful.

I've heard that big changes in ambient temp creates the need to recalibrate - shouldn't it be a big change in the sensor temp as read out on the EVF? Like if it drops from 50C to 44C. Who cares what the temp is outside - it's inside on the sensor that drives noise. If that is correct, then what is the on-sensor temp spread that necessitates a recal?

 

[TheBied]

Thanks Matt,
How about posting a sticky official document on all things Black Shading: when, how, why, issues, examples . . . everything there is to know on the subject. This would be very helpful.

I've heard that big changes in ambient temp creates the need to recalibrate - shouldn't it be a big change in the sensor temp as read out on the EVF? Like if it drops from 50C to 44C. Who cares what the temp is outside - it's inside on the sensor that drives noise. If that is correct, then what is the on-sensor temp spread that necessitates a recal?

I think a more appropriate place for the information would be the Ops Guide. But I agree, black shading needs better documentation our part.

Sensor temperature certainly plays a large role in the overall noise of the sensor. From my experience, anywhere between a 5 and 10 degree swing you'll start seeing better results in the dark with a re-calibration. Again, that's on the sensor temperature.

The first temperature we readout in the bottom status bar is the sensor temperature and the other is for other critical internal electronics. The sensor calibration temperature is visible in the system configuration menu.

Looking forward, (in addition to making the entire calibration process smoother) we're looking to add warnings if the camera detects a deviation between the current sensor temperature and the calibrated temperature.

 

[Mohamed Younis]

I think a more appropriate place for the information would be the Ops Guide. But I agree, black shading needs better documentation our part.

Sensor temperature certainly plays a large role in the overall noise of the sensor. From my experience, anywhere between a 5 and 10 degree swing you'll start seeing better results in the dark with a re-calibration. Again, that's on the sensor temperature.

The first temperature we readout in the bottom status bar is the sensor temperature and the other is for other critical internal electronics. The sensor calibration temperature is visible in the system configuration menu.

Looking forward, (in addition to making the entire calibration process smoother) we're looking to add warnings if the camera detects a deviation between the current sensor temperature and the calibrated temperature.

That would be awesome and save a lot of people's time. I personally black shade every couple of days just to be sure.

 

[Will Keir]

+1 on that. I'd like to see an official stick on BS. I've had to read through 20 or so threads to learn what I could in one stick.

Thanks Sticky Makers!

Thanks Matt,
How about posting a sticky official document on all things Black Shading: when, how, why, issues, examples . . . everything there is to know on the subject. This would be very helpful.

I've heard that big changes in ambient temp creates the need to recalibrate - shouldn't it be a big change in the sensor temp as read out on the EVF? Like if it drops from 50C to 44C. Who cares what the temp is outside - it's inside on the sensor that drives noise. If that is correct, then what is the on-sensor temp spread that necessitates a recal?

 

[Will Keir]

Mine was 33c indoors which was about 68 degrees F.

Would also like more info on this flat field. Also what temp is up-to-temp (39c)
We should be viewing the red curve not the RAW view as well?

 

[Trevor Meeks]

Mine was 33c indoors which was about 68 degrees F.

What exactly was 33c? That's not really warmed up at all... the camera generally operates at higher than 33c... black shade at 33c and you'll get more noise the hotter it gets. Let it heat up (turn the fan down to 30-35%, leave the camera on for 15 minutes or so) then run black shading around 60c and your images theoretically should be much cleaner under normal operation.