Andoer 500mm/ 1000mm F/8 High Power Camera Telephoto Lens Manual Focus For Nikon D40 D40x D60 D90 D100 D200 D300 D500 D600 D610 - Photo Studio Kits - AliExpress
Nikon DX format - Wikipedia
Amazon.com : Extender 2.0X (Doubler) for Nikon D40 : Electronics
Amazon.com : Nikon D40 6.1MP Digital SLR Camera Kit with 18-135mm f/3.5-5.6G ED-IF AF-S DX Zoom-Nikkor Lens : Electronics
T2 T Mount Lens Adapter for Nikon D40 D3000 D3100 D3200 D50 D60 D5000 D5100 D70 | eBay
Amazon.com : Nikon D40 6.1MP Digital SLR Camera Kit with 18-55mm f/3.5-5.6G ED II Auto Focus-S DX Zoom-Nikkor Lens : Digital Slr Camera Bundles : Electronics