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IR Effect?

ND1.2 + ND.9 No IR

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#1 Philipp Kunzli

Philipp Kunzli
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  • Cinematographer
  • Zurich & Cologne

Posted 20 May 2016 - 01:28 AM

Hey Everybody

 

For an upcoming shoot, I was testing a few frame rates and so on.

 

Unfortunately I didn't have a IR Cut ND on hand. Since I was going for

full open, I sacked a regular ND1.2 and a ND.9 together.

 

The test was shot on the Alexa (first series). 

 

I was quite surprised when I saw the footage. The scarf I'm wearing in the image has in real life no color!

Thru the whole test footage it has this reddish color. I my opinion quite strong...

 

Is a missing IR CUT that strong?

 

What's your thoughts. 

Attached Images

  • NO_IR_2.jpg

Edited by Philipp Kunzli, 20 May 2016 - 01:29 AM.

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#2 David Mullen ASC

David Mullen ASC
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Posted 20 May 2016 - 02:04 AM

There are many articles showing IR pollution on different fabrics such as this test:
http://www.erwinvand...ution-filtering

Keep in mind that different cameras and sensors have different sensitivities to IR, and some are more sensitive to near-infrared than infrared and need a different IR cut. Lots of articles on the topic for you to search out. Here's a good one:
http://www.creativep...is-alexa/423084
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Aerial Filmworks

The Slider

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Gamma Ray Digital Inc

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Tai Audio

Glidecam

Rig Wheels Passport