Weird Noise - Probably my lens, but help needed!

[Josef Gatti]

Hi all,

So I was doing some tests out in the evening/night and I just got home to go over the footage. All was great until I bumped RCX to 100% display and I've got this weird noise in my footage. The noise stays in the same place on all affected shots.

It's only on footage from my Tokina 11 - 16. Could this just have been dust on the lens? Would love a bit of clarification as to what this could be, or if anyone's experienced anything similar.

This is pulled from a 5k still. I was shooting 1fps and a shutter speed of 1s.

 

[Phil Holland]

That's not dust. Did you perform a black shading first at 1fps and 1sec exposure? Doesn't look to me that you did.

 

[Josef Gatti]

Guilty. I was going back and forth between a few settings, would that explain the noise in the same place for all shots at 1sec 1fps?

 

[Phil Holland]

Pretty much. It can be cleaned up in post though.

Whenever you change your shutter speed to a slower rate than your previous black shading calibration you should always run a black shade calibration again.

If you are going faster than your current black shading calibration you should be fine.

 

[Ryan Hamblin]

good to know. thanks Phil. who has time to do a black shade in the field though... hopefully dragon is much faster at this.

 

[Josef Gatti]

Exactly why I didn't Ryan. Was only test shooting and it was nearing the end of the day, got lazy hah.

Thanks Phil, mind is at peace now. Makes sense

 

[Timothy Carr]

Wow, i have similar problems but i did blackshade... Except i was on 4k 24fps... 1/48, daylight lighting....

 

[Antoine MARTEAU]

Got the same problem at 1fs night shots in Africa on Epics. Solved with black shading "at current fps".
I still have to check if a 1fps black shading might work at 24fps. Probably not...

Just have to anticipate this black shadings...

Antoine

 

[Björn Benckert]

Got the same problem at 1fs night shots in Africa on Epics. Solved with black shading "at current fps".
I still have to check if a 1fps black shading might work at 24fps. Probably not...

Just have to anticipate this black shadings...

Antoine

It probably does work. But I think you then do not use the full range of the sensor. I might be mistaken here but I think thats how it works.