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Questions regarding IR photography...

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Old 06-06-2009, 12:52 PM
rbid's Avatar
rbid rbid is offline
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Questions regarding IR photography...

Hello,

I'm playing with IR photography (With my Nikon D70s and a Hoya R72 filter).

My problem is that I get to blue tainted photos after switching the red-blue channels in Photoshop. I guess that I'm doing something wrong. Can someone give me a hint what is wrong?

The equipment: Nikon D70s, 18-70 Kit lens, Hoya R72 Infrared filter.
Note: The camera is not infrared converted!

The camera preset: Like explained in this tutorial.
  1. NEF as photo quality (Raw)
  2. ISO set to 200 (Minimum possible value)
  3. Preset White balance using grass under direct sunlight. (See note below)

I guess that here is my mistake: Should I do this preset with or without the IR filter?

After I take the photos, they look to red. I also have done some bracketing (+1EV, -1EV) for playing later on.

What is the correct exposure correction needed? (I guess that the photometer on the camera is not calibrated for IR).

Also I know that I need to compensate for IR (depth of field, focus). The lens I'm using does not have any IR shift sign, what are the rules of a thumb for this case?

On Photoshop, I swap the Red-Blue Channels, and the result is a bluish photo, which is not what I intended.

Any help/hint?

Thanks in advance.
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Old 06-07-2009, 01:18 AM
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andyong andyong is offline
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Posts: 174
Re: Questions regarding IR photography...

set the WB preset with filter attached.so it won't give your photos look red.you can do experiment preset WB to blue (sky) or green (grass or leafes) or preset it to white card.

my suggestion to your previous photos that looks red, you can auto level it first before swaping the chanel.

exposure compensation +1 is good.
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