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Black Shading To current FPS Failed.

jan meric

jan meric

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Hi guys,

I tried to do a current Fps black shading and it failed to do so, am i doing something wrong?, when i do default black shading that seems to be working, I read that If i do proper black shading i should not get too much noise, but I get noise no matter what even though the room is fairly bright. I know that some of you went through these problems and can guide me to the best links or best answer, thank you in advance.
 
Just on the noise front, do you have any focus assist settings turned on?

Does the noise show up in red cine?
 
Hey Jan,

Make sure when performing a black shade to let the camera warm up and get to its operating temp before running the blackshade. Otherwise you will get noise at higher temps as you blackshaded when the camera was cold.

If any of the focus assist functions are on as Louis asked, you will notice "noise" which is a focus assist function. It won't show up in actual footage but just in the monitor/evf to assist with getting proper focus much like the peaking function on digital broadcast camera's.
 
I had the focus assist setting turned on, so i take it that its not a good thing for noise?
 
it doesnt record to the actual footage. It's just to help you nail focus....It in no way effects your footage, but when viewing in camera you may get the "this looks really noisy response."

Turn off the focus assist and see if you still get the noise.
 
thank you guys, how long before the camera gets to its warm stage for me to do a blackshading?
 
Also you can only blackshade at certain FPS settings, so if you for instance were trying to black shade at 60FPS it probably will give you an error message, just blackshade to 24 FPS and also set your time base to 24fps... Any changes to the camera after this will be beautiful.
 
How often should I black shade? thank you for the helpful answers guys really appreciated it.
 
jan meric said:
How often should I black shade? thank you for the helpful answers guys really appreciated it.
Click to expand...

Large change in temperatures... Frame Rates ... possibly mount changes.... Look through the forum there is a post if not several in the subject.
 
I would also add it's a good habit to perform a blackshade each day of a shoot to ensure optimal performance. Just do it during setup in the morning... It's not necessary to do it that often but it just keeps the sensor tuned.
 
So basically, if we're going to shoot 2k at 60fps, we should do a black shade at 4k, 24fps using default black shade (since it will give error if set to 60fps)? Or should we at least do a 3k 48fps and use "current fps/exposure"?
 
Resolution doesn't matter here, since the whole sensor gets calibrated and the lower resolutions are just windows.

Changing the shutter by a factor of two doesn't matter as well. It's more like going from 1/48th to 1/5th of a second when you should care.
 
Uli Plank said:
Resolution doesn't matter here, since the whole sensor gets calibrated and the lower resolutions are just windows.
Click to expand...

Right, but I'm forced to change to 2k since I want to shoot 60fps. So my question is, should I still calibrate at 24fps default, or would I use 48fps "current fps/exposure" since it might be more accurate based on the 60fps that I will be shooting?
 
you dont need to blackshade above 24fps if you have blackshaded at 24fps. It is only recommended to blackshade again when shooting less than 24fps.

Black shade at 24fps and you should be good for everything above that.
 
Just as tip regarding warm up (and something you can see happening) try turning on without a lens (or with lens cap on) & crank your iso to max.

Then, watch the screen (you can always magnify to see more crazy dancing pixles ;) - basically, you'll see it 'warm up' as areas will change colour and eventually normalise. Bear in mind that this is pushing the iso just to see what's going on... but it is an interesting viusal clue to the warm up cycle.
 
There is so much User Generated Disinformation on this subject - including this thread. Would love to get an Official RED Black Shading Sticky and be done with it.
 
Josh Beadle said:
There is so much User Generated Disinformation on this subject - including this thread. Would love to get an Official RED Black Shading Sticky and be done with it.
Click to expand...

so far everything said here is what RED has recommended in another thread...
 
@eric
Nice work - now send me to that link that has RED Official engineering style specific information for Black Shading - like in a single process control style document. What has be stated is soft, conversational information that lacks specifics and hard numbers.
 
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