Myst Exile...Prism Puzzle

Hi Everyone,
Here I am stuck at the Rainbow Prism Puzzle. I've just finished going to all the colored reflectors. I set each one according to Witchen's WT.
Now I'm back on top at the Red reflector. I turned it once, moved to the left and looked in.
The beam is supposed to be on prism devise at the entry to the Voltaic tusk.
I see the yellow reflector. I'm sure I should see the prism devise in order to get into the tusk.
What have I done wrong? What do I need to do now.
Urabeth <img border="0" alt="" title="" src="graemlins/woozy.gif" />

Urabeth, you need to focus each one with your back to the one you sent the light FROM. Don't turn one around to look somewhere else once it's focused, you will lose the Prism on the wall. If you haven't done this next bit yet, go up to the top of the Greenhouse and focus the correct viewer on it. The little balls on the viewer have to be set as well.

I started again at the first reflector. When I got to the doorway I realized I needed to press each button at the correct colors. Didn't get that the first time I did it...Daaaaaaa! The WT I had didn't mention it either. That's OK, I'm headed for the Water Wheel Puzzle now. Hope this one won't be another Daaaaa!, for me.