Response to Maco IR820c Speed Rating? Your experiences? General Discussion...

You refer to the "infrared effect" or "wood effect" that you do not get with an orange filter. What most people do not realize is that the "yellow father" cheats a little in this respect. If you use different filters on HIE you will always notice very light or white foliage on the negs, mostly not depending on the spectrum band of visible light you remove by filtering. Physically this phenomenon does not make much sense, since the IR spectrum is only a minimal portion of the wavelength the film records. HIE has a heigthened blue and green sensibility and much what people consider "IR" effect comes through this. With an IR film that has a more or less panchromatic rendition (which the Maco 820 has) you will get a very different response depending on the wavelength you actually record on the film. This is one of the points that makes the Maco so superior, since you have much more versatility and control over the situation. With a Wratten 87 filter you will have a totally different realisation than with a red filter. I see this with infrared reflectography, for which I use the film. By using different filtration I get very different results in penetrating the colour layers of paintings and by comparing these differing results I get a far better "picture" of what is going on. The results with HIE and different filters often very, very similar. Also the grain and resolution speak for the Maco.

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