Pierre J. Proudhon wrote:

The results are different if you spent any time using IR film. All
Infrared film is sensitive to both some Infrared and visible light.

Digital IR photography typically relies on reflected NIR from sources
like the sun and incandescent lamps. Digital camera sensors based on
silicon are not sensitive to the far (thermal) IR wavelengths (typically
3.0µ and longer) emitted by objects at room to body temperatures. Heat
leaks from houses aren't visible in the NIR, and people, animals and
other objects at room to body temperatures don't glow in the NIR any
more than they do in visible light. To photograph them in the dark, you
have to provide proper NIR illumination using a suitably equipped camera
like the Sony DSC-F7x7 or an external NIR-only flash with no filter.

I can go on but you bore me.

The fact that the results are different does not make one more valid
than the other. Digital sensors don't have the same halation of many IR
films, so the results look a bit different, that's all.

What you then say about digital IR also applies to film IR, since both
rely on reflected NIR. IR film also does not have sensitivity beyond the
NIR, typically cutting off before 1000nm, so I don't get the point you
are trying to make.

Cheers,

Wayne

--
Wayne J. Cosshall
Publisher, The Digital ImageMaker, http://www.dimagemaker.com/
Blog http://www.digitalimagemakerworld.com/