How many frames should I be able to achieve on continuous burst shutter mode? I have my camera set to large fine image size and using a Sandisk 8GB 30mb/s SD card. On continuous burst I am getting 4 frames before the shutter delays waiting for the buffer to 'catch up'. Is this normal as when I had a D50 I could fire away and achieve significantly mors frame before buffer lag. really appreciate any comments/advice as it is extremely frustrating.