I changed to a grid screen in my 40D, use it for leveling the camera when I don't have or want to put a level in the hotshoe. Haven't bothered switching my 1D from the standard screen since the grid ...

So, I'm trying to do more manual focus, but I'm having issues at times, likely due to the way dSLR manufacturers have prioritized auto-focus over manual focus in their AF systems & focusing screens.

Go into your camera’s image quality settings and enable RAW to capture the most exposure data from your camera. If you’re ...