Monitor flicking in low light.

The place for questions about shooting with Blackmagic Cameras.
  • Author
  • Message
Offline

Ryszardkarcz

  • Posts: 12
  • Joined: Sun May 19, 2013 3:05 pm

Monitor flicking in low light.

PostWed Dec 11, 2013 3:55 pm

Hi, I've noticed strange behavior of the screen of my bmpc.

When the display is set to "video" the (very) low lights- near black are flicking on the screen. No trace of that on the recorded images.

It was upsetting me a bit and I whent back to the seller to show the problem, after test, the problem occured also on his demo camera.

He's explanations was "they use cheap screen" (trad: it's normal to have default for this price). I think it's quiet anoing has it occured anytime when shooting low-light condition and I'm considering it has a manufactor default.

Did you guys had kind of same experience? Could it be a software error? I have find nowhere in the forums talking about that, but You MUST have noticed that if it's happening on your camera.
Offline

Ryszardkarcz

  • Posts: 12
  • Joined: Sun May 19, 2013 3:05 pm

Re: Monitor flicking in low light.

PostSun Dec 15, 2013 1:56 pm

...
Offline

christiangruner

  • Posts: 56
  • Joined: Thu May 02, 2013 11:39 am
  • Location: Copenhagen, Denmark

Re: Monitor flicking in low light.

PostSun Dec 15, 2013 2:05 pm

And you are sure this is not just flickering from the lights ?
Offline
User avatar

Christian Schmeer

  • Posts: 904
  • Joined: Sat Sep 29, 2012 5:07 pm
  • Location: London, UK

Re: Monitor flicking in low light.

PostMon Dec 16, 2013 5:40 am

Try to change your shutter angle and see if it makes a difference. It might just be that the lights are flickering, which is normal and will happen on any camera that is set to the wrong shutter angle for the frequency of light they are emitting.
Christian Schmeer - DP / Colourist
www.christianschmeer.com
www.vimeo.com/christianschmeer
Offline

Ryszardkarcz

  • Posts: 12
  • Joined: Sun May 19, 2013 3:05 pm

Re: Monitor flicking in low light.

PostTue Dec 17, 2013 9:46 pm

Yes it isn't light fliwking.

It happens in all area of the screen whit any kind of light, from tungsteen to daylight, as long it as a very low (near black) value inside the screen, only in "video" display mode.

Please do a test whit your specimen if you own one.

I'm really impressed that nobody noticed that before.

R.K
Offline
User avatar

Christian Schmeer

  • Posts: 904
  • Joined: Sat Sep 29, 2012 5:07 pm
  • Location: London, UK

Re: Monitor flicking in low light.

PostTue Dec 17, 2013 10:19 pm

Do you have another camera to take a video of the issue? It might be worth contacting BMD support. Sounds like an issue with your camera.
Christian Schmeer - DP / Colourist
www.christianschmeer.com
www.vimeo.com/christianschmeer
Offline
User avatar

Yavor Dimitrov

  • Posts: 36
  • Joined: Sat Mar 16, 2013 12:23 pm

Re: Monitor flicking in low light.

PostWed Dec 18, 2013 3:33 am

It isn't just his camera. I have the same issue with mine. After doing some experimentation, it is definitely something to do with the monitors "Video" mode.


It doesn't make sense for the monitor to be doing this. No LCD monitor is that bad. It is my belief that this is a firmware issue with the way the camera monitor processes the low light signal in the "Video" mode.

It would be great for BMD to comment on this.
Offline

Ryszardkarcz

  • Posts: 12
  • Joined: Sun May 19, 2013 3:05 pm

Re: Monitor flicking in low light.

PostWed Dec 18, 2013 11:09 am

Christian Schmeer wrote:Do you have another camera to take a video of the issue? It might be worth contacting BMD support. Sounds like an issue with your camera.


The seller of the bmpc did try whit his demo camera when I went back to the shop for repporting the issue.

We saw exactly the same issue on his camera. Might be some software tricky thing, but if not, this is really anoing.
Offline

Fred DiNoto

  • Posts: 10
  • Joined: Wed Jan 22, 2014 9:27 pm

Re: Monitor flicking in low light.

PostWed Jan 22, 2014 9:29 pm

Hello

i have the same issue on my BMCC, but only when the shutter angle is at 180° and both in video and film mode...
Offline

Peter Kent

  • Posts: 47
  • Joined: Fri Apr 12, 2013 12:02 pm

Re: Monitor flicking in low light.

PostThu Jan 23, 2014 1:39 am

Yeah I have the same thing on the pocket, I started seeing it as soon as I updated to 1.5.1, I was going to start a topic but then noticed it wasn't in my actual footage or hdmi out so figured it wasn't worth it.

I happens in both Video or Film curve mode but easier to see in video. It's on the darkest shadows and I assume it's a feature not a bug, it looks like it's warning me of crushed shadow detail; like how zebras warn of clipped highlight detail. I tried turning zebras off but the under exposure still flikers so maybe that's a bug (the fact that you can't turn them off) or maybe its really just a horrid LCD lol. ...Or maybe it's the beginning of a false color option :D. Either way I wouldn't worry about it too much.

If you want to test it at home here is my recomendation:
1. Set curve to video.
2. Set ISO to 200
3. Set shutter to 180
4. Point it at some dark shadows (but not the show)
5. Close down the iris until you see a very faint flickering.
Offline
User avatar

Christian Schmeer

  • Posts: 904
  • Joined: Sat Sep 29, 2012 5:07 pm
  • Location: London, UK

Re: Monitor flicking in low light.

PostThu Jan 23, 2014 2:16 am

Monitor flicker straight after a firmware update is normal, shouldn't stay though...
Christian Schmeer - DP / Colourist
www.christianschmeer.com
www.vimeo.com/christianschmeer
Offline

Peter Kent

  • Posts: 47
  • Joined: Fri Apr 12, 2013 12:02 pm

Re: Monitor flicking in low light.

PostThu Jan 23, 2014 2:30 am

Christian Schmeer wrote:Monitor flicker straight after a firmware update is normal, shouldn't stay though...


Why is that normal?

Return to Cinematography

Who is online

Users browsing this forum: Bing [Bot], danielpanev, Joshua_G, timbutt2 and 27 guests