Extender 2.0x (Doubler) For Nikon D40 - Walmart.com
Nikon D40 Manual Focus High Power 1000mm Lens - Walmart.com
Amazon.com : Extender 2.0X (Doubler) for Nikon D40 : Electronics
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Nikon D40 Lens Mount Replacement - iFixit Repair Guide
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Nikon DX format - Wikipedia
Nikon D40 Specifications
Nikon D40 Specifications
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T2 T Mount Lens Adapter for Nikon D40 D3000 D3100 D3200 D50 D60 D5000 D5100 D70 | eBay
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