some info from web, noything from me, for refernce:

Nikkor AF18-35mmF3..5-4.5 IF ED http://photo.net/ezshop/product?product_id=52
http://www.photozone.de/8Reviews/len...3545/index.htm

Tamron AF17-35mm/2.8-4 http://photo.net/equipment/tamron/17_35_Di/
http://photo.net/equipment/tamron/17_35_Di/index2
http://www.photozone.de/8Reviews/len...ikon/index.htm

Sigma AF 17-35mm /2.8-4 HUM
http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00Id1Y

Survey http://www.photozone.de/active/surve...r%20AF'%22

User Rating
http://www.photodo.com/products.html