znhcl wrote:so basicly we i can used any lens for nikon? but wather i have the funtion of AF or not right?
For auto focus You can use any Nikon lens that is a AF-S lens or a Sigma Lens that is a HSM lens. This is because the D40/40s does not have auto focus motor in the camera. So you need a lens that has a focus motor in the lens to work the auto focus. So this means you can not use any lenses from Tokina or Tamron if you want to auto focus, but will work in manual focus.
Best place to get lenses I goto is
http://www.bhphotovideo.com/
Here is a list of lenses from Nikon with AF-S
AF-S (Silent Wave Motor) Lenses
AF-S DX Zoom-NIKKOR 12-24mm f/4G IF-ED
AF-S NIKKOR 14-24mm f/2.8G ED - NEW!
AF-S Zoom-NIKKOR 17-35mm f/2.8D IF-ED
AF-S DX Zoom-NIKKOR 17-55mm f/2.8G IF-ED
AF-S DX Zoom-NIKKOR 18-55mm f/3.5-5.6G ED II
AF-S DX Zoom-NIKKOR 18-70mm f/3.5-4.5G IF-ED
AF-S DX Zoom-NIKKOR 18-135mm f/3.5-5.6G IF-ED
AF-S DX VR Zoom-NIKKOR 18-200mm f/3.5-5.6G IF-ED
AF-S NIKKOR 24-70mmf/2.8G ED - NEW!
AF-S NIKKOR 24-85mm f/3.5-4.5G ED - NEW!
AF-S VR Zoom-NIKKOR 24-120mm f/3.5-5.6G IF-ED
AF-S Zoom-NIKKOR 28-70mm f/2.8D IF-ED
AF-S DX Zoom-NIKKOR 55-200mm f/4-5.6G ED
AF-S DX VR Zoom-NIKKOR 55-200mm f/4-5.6G IF-ED
AF-S VR Zoom-NIKKOR 70-200mm f/2.8G IF-ED
AF-S VR Zoom-NIKKOR 70-300mm f/4.5-5.6G IF-ED
AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED
AF-S VR NIKKOR 200mm f/2G IF-ED
AF-S VR Zoom-NIKKOR 200-400mm f/4G IF-ED
AF-S NIKKOR 300mm f/4D IF-ED
AF-S VR NIKKOR 300mm f/2.8G IF-ED
AF-S NIKKOR 400mm f/2.8D IF-ED II
AF-S NIKKOR 400mm f/2.8G ED VR - NEW!
AF-S NIKKOR 500mm f/4D IF-ED II
AF-S NIKKOR 500mm f/4G ED VR - NEW!
AF-S NIKKOR 600mm f/4D IF-ED II
AF-S NIKKOR 600mmf/4G ED VR - NEW!
hope this helped.
David