I tried doing 2.5k and got about 20 frames or so. Can't remember. My SD card is a Sony brand maxing out at 19mbs. But I got about one second at 1728 x 1152 at 14 frames. The quality is amazing and I just wish this camera could squeeze a few extra seconds at 24 frames. Neat no matter what. It's been fun but because of the camera's hardware limitations I can't really use it's raw feature for my regular work.