Hey All, I Have A Nikon 105mm Vr For My D40x. It's The Best Thing Since Sliced Bread!!! I Didn't Want To Pay The Price But That Vr Is Well Worth It For Me. I'm Old And Getting Very Shakey. Without Vr I Must Use A Tripod All The Time, With Vr I Am Able To Hand Hold Most Of The Time. I Assume Vr On A Zoom Works As Well As On A Fixed Focual But What Do I Know. As To A Non-nikon Lens, I've Always Used Nikon Lenses And Been Happy With Them. Well, Except For The Price But Then I Can't Get Any Lens For What I Really Want To Pay. Another Thing To Consider In One Word - Used. Just My Two Cents Worth.