I have large number of photos I am saving in the Tiff format. They are two to three times the size of the RAW file.
Is there a way to reduce the size of the TIFF files but not lose any image quality?
Yes there is, save the TIFF's with a zip-compression, which is lossless. Your raw file is n-MegaPixels of, at most, 16 bits. The tiff file is n-MegaPixels of, at least, 24 bits, and probably should be saved as 48-bit pixels, so the tiff will be larger than the raw without compression.