TURBO: hm, tak jinak, pravda je někde uprostřed:
" Canon 10/300/350/400/450/500/550/1000D camrea change split-image or micro-prism focusing screen the focus point will disappear,can only use center focus point, can't use to change focus point function. For resolving this problem...... We will mark focus point in the focusing screen Comparison BE 1:1,The focusingscreen will be able to use and change focus point.Focus point will show but can not bright.
But had point mark,You can select any of the AF points manually.You can from viewfinder information see the focus confirmation light or basis focus voice to confirmation in focus"
http://www.focusingscreen.com/work/canon_aps_docen.htm