Bring them all! Otherwise, the one you will want to try will be the one at home. I don't remember which ones I packed for Tonopah 2 weeks ago (we just got back last night from a run to San Diego via Albuquerque and Prescott and back via Phoenix and Moab) but they probably could range from 159 to 672 mm for the 8x10, although I may have skipped the 159. I made an adapter to front mount a Packard. By the way, as we went through Monument Valley it looked like Mark was really getting it over Ignacio way. I only had a driveway full of snow to welcome me. Fortunately, the forecast through Friday looks good for getting back over the mountains. The ETA at the Silver Queen should be Saturday afternoon.