Thanks Sheiky for the advice! I'll definitely try that. I just installed an Ef-S screen on my 40D & its much easier doing manual focus with it. The reason why I was asking the above is bcoz Im planning to go for a Zeiss Planar 50mm 1.4 ZE or a Zeiss Makro Planar 50mm 2 ZE. Both of the are manual focus. So its gonna be difficult to recognize if my copy will be crappy. Don't you think so?