Does anyone know what the largest sensor size is that would be compatible with Canon's EF-S mount? The actual sensors used in the Canon Rebel and x0D line vary a little, from the 22.2 x 14.8 mm (3.28 cm²) sensor in the 400D to the 22.3 x 14.9 mm (3.32 cm²) in the 500D and 50D to the 22.5 x 15 mm (3.37 cm²) sensor in the 30D. The sensor in the 2002 D60 was even bigger: 22.7 x 15.1 mm (3.42 cm²), which gets closer to Nikon APS-C size 23.6 x 15.8 mm (3.72 cm²). So my point is, could Canon develop 1.5x or even 1.4x sensors that would still be compatible with the EF-S mount, or is there just not enough room for the mirror in that case? Also, would that even work well since the lenses weren't designed with a sensor that big in mind?