Some photographers carry color meters or compensation charts & info for the film they use in varying light. The charts & meters tell when to add a color correct ion filter to compensate for color temperature variations of a films color shift with longer exposures. Does this fall into "the use of filters"? I say it does not as one isn't trying to change the image rendition but to keep it true to the film we choose. After all, Velvia is Disneychrome & isn't exactly 'accurate' anyhow, but using CC filters to keep its color within the expected r ange isn't an attempt to change the colors but to keep them where we think they should be. If we want to change them we can use an enhancing filter, added filtr ation, etc. I come onto the question after seeing some super saturated images from SoUtah re d rock country. Saturation *almost* unbelievable if I had not seen it personally . Saturation some viewers look at and peg immediately as fake. Yet I know it isn 't, it is Velvia giving the saturation we saw when we shot the images(with Velvi a specifically chosen for its super saturation) The skies in the background are still blue & the whites are still white. No printing tricks other than using Ilf ochrome to make the Velvia pop on paper as it does on the slide. So, with some seeing the photographer using a CC filter & yelling "he is cheatin g" while he is trying to filter the film to its factory expectations, and not us ing enhancing filtration, is his use "natural" and "without filters"?