ka7197
Established
While there might be a few good reasons to shoot JPEG only (as opposed to Raw or Raw+JPEG), just saving disk space isn't one of them. So don't do that!
If you're concerned with the huge size of the Leica M9's 35 MB DNG files then switch to compressed DNG which will cut the file sizes in half. Furthermore, shove the DNG files through Adobe DNG Converter—you may think that's silly but actually it does make sense because it will convert the files from DNG 1.0 format to DNG 1.3 format which includes lossless compression which will reduce the DNG file sizes even further. A doubly compressed DNG file will be only slightly larger (if at all) than a file in JPEG Fine format but will preserve much more depth and latitude for subsequent post processing than JPEG.
If you're concerned with the huge size of the Leica M9's 35 MB DNG files then switch to compressed DNG which will cut the file sizes in half. Furthermore, shove the DNG files through Adobe DNG Converter—you may think that's silly but actually it does make sense because it will convert the files from DNG 1.0 format to DNG 1.3 format which includes lossless compression which will reduce the DNG file sizes even further. A doubly compressed DNG file will be only slightly larger (if at all) than a file in JPEG Fine format but will preserve much more depth and latitude for subsequent post processing than JPEG.