I figured before I started all my testing and synchronizing my digicam to B&W film I thought I'd ask a few questions first and see if others have gone down this road before. Please keep in mind hat I am not talking about the use of the digi cam as the final image capture device, that will be film. But I am trying to replicate the use of polaroid as a test or visualization tool with the digicam. Is there any sort of reciprocity failure that digicams get when working at long exposures? Like 1-15 minutes? Is the color sensitivity of the ccd's completely linear when used in B&W mode or do they have varying color sensitivities like B&W film? Any experience or advice would be appreciated. Thanks.