through IRND Filters help to even out the blacks reaching the
Cynthia Webster DP
Yes, if there's actual IR present. Even when subtle (and depending
on the camera/lens/sensor), the changed blacks are the first thing I
notice when IR is present, as they usually tend to go a
brownish/reddish color on camera.
But it also depends on the material doing the reflecting. I once
shot a promo with a four person Mariachi band all wearing tuxedos.
All the tuxes looked black to the naked eye, but depending on the
material used, they went different colors on camera from subtle
browns to subtle greens. The only one that remained black was the
one that seemed to be made with cotton. 100% cotton seems to absorb
the IR and not reflect it back into the lens.
It has been my experience that a well used all cotton flag shoved in
front of the camera can often be used as a 'standard', since unless
the IR is wildly out of control (shooting outside in bright sunlight
with a ton of non-IR coated NDs), it will remain black in the
presence of moderate IR. I used to use that trick to answer the
question of "Why are the blacks different colors? What's wrong with
your camera?" If the flag stayed black, the answer was "Nothing at
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