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FORUMS Photography Talk by Genre Still Life, B/W & Experimental Talk 
Thread started 17 May 2014 (Saturday) 07:05
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Infrared and ND filters?

 
Photo123abc
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May 17, 2014 07:05 |  #1

Hi! I just bought infrared filter (Haida 720nm), I wonder is it possible to use ND filter for longer exposure time = more IR? Or does ND filter block IR? I tried search but couldnt find the answer.

Also, any tips and tricks for post-processing, white balance, etc. appreciated. ;)


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jjphoto
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May 18, 2014 16:55 |  #2

ND filters have varying effects on IR. Don't quote me, (just going by my fast fading memory) the B+W 110 (10 stops) lets through way more IR than the Hoya NDx400 (also about 10 stops). I understand that this accounts for the warm cast you get with the B+W on Canon bodies whilst the Hoya has much less colour cast, or even slightly cool. I have seen charts showing the filters response with wavelength so you might have to hunt around a bit more to find them.


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iroctd
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Jun 14, 2014 15:32 |  #3

I found this when looking into polarizing filters...

http://www.lifepixel.c​om …ternal-filters-nd-filters (external link)


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calypsob
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Jan 24, 2015 03:48 |  #4

on an unmodified camera the ir filter will act as a ND filter because it will take a long time for the IR to pass through the highpass filter and create an exposure. By adding a ND filter you are increasing this exposure time. Because you are shooting IR, you will only get IR colors, as I am sure you know. I imagine that you would need to expose for several minutes with an unmodded camera, 700+nm and a nd filter.


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Infrared and ND filters?
FORUMS Photography Talk by Genre Still Life, B/W & Experimental Talk 
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