little complain about the dual card system on 5D III

[Ryant]

For pro use, shoot RAW + jpeg, put the CF cards in your pocket and leave the sd card in your camera. So when your camera gets stolen, or your pocket explodes, at least there's another copy somewhere.

Exploding pockets are uncommon, however

Yup. I write RAW to the CF and JPG to the SD. The SD is nothing more than a rolling emergency backup. NEVER delete images in camera. Very very bad practice.

I delete images on the camera all the time, why is this a bad practice? Canon added the delete button for a reason. I have done this on every 5d body without any corupt cards or issues. I admit i dont shoot as much as pros though so i am really currious why people sometimes say this. I think recording to cf is a bad practice because it slows the camera down. I can see how you might want it if your doing a wedding though. You might want to turn it off if you were to shoot a burst to capture the bride throwing flowers because you will get more pictures. With Cf the max burst is 7 with only cf the max burst I got is 18 with a Lexar 600x. Supposedly the ad card can even slow down the burst as well.

Ryan