Next size up from 6x4 that wont be cropped?

[At The Gates]

Hi,

On an SLR with a 3:2 sensor 6x4 is a perfect fit with no cropping. But what is the next size up that won't be cropped? Is it 12x8 (6x2,4x2)?

Thanks!

[barryk]

9x6

[puddleduck]

15x10 works great, get an oversized frame, and matte it - great prints.

[emeyedeejay]

Any combination where the shorter side is 2/3 of the longer side or the longer side is 1.5 times the shorter side :D