I have the C700 with the standard head. It works fine for 645 up to 11x14. The only problem is that the column is not that tall, so your cropping is limited on 11x14 paper. I have a Saunders easel and find it awkward to use on paper smaller than 11x14 because the easel will hit the column using the 8x10 paper slot. This is due to the fact that the carrier projects a vertical image, so the easel needs to be rotated accordingly. I just worked out the measurements using 8x10 paper in the 11x14 slot. Less convenient, but it works. The carrier can be purchased new from BH for $69 if you want to go the new route.