I shot a single NEF file, ISO100, and produced 5 exposures (-3, -1.5, 0, 1.5, 3), saved as TIF, and loaded them into Photomatix. The result is pretty saturated and contrasty, but for a first try at HDR, that is what I was going for. http://rhernals.smugmug.com/gallery/5719113_NNVEr#352965793_bdXiu You can view the original image there. The noisy areas are the windows. I ran it through NoiseNinja, which helped, but it's still noisy. My question is - has anyone else had problems with the final image from Photomatix? Edit: Maybe that's not so much noise as it is just the window screens?