Re: Why files ADobe tiff in finder?
.tif is the 3-letter extension for TIFF files. Why they called it a TIFF file instead of some other format or even .RAW, I have no clue whatsoever.
As for changing the extension that you want the 1Ds to use, unfortunately, that won't be possible without a firmware hack. And even if you did change the extension coming out of the camera, how about the RAW converter programs that look for the .TIF extension when processing 1D or 1Ds raw images? They would need to be changed, too, to recognize the new extension that you want to use.