EN-EL9 EN EL9a LP Battery Charger Set, 2-Pack Backup Battery and Charger, Compatible with Nikon D40, D40X, D60, D3000, D5000 Cameras, Replacement for Nikon EN-EL9, EN-EL9a Battery and MH-23 Charger : Amazon.ca:
Nikon's official D850 lens recommendation list: Digital Photography Review
Nikon Lens Abbreviations
Review Nikon D40 | Happy
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Nikon D40 6.1MP Digital SLR Camera (Lens w/ 18-55mm) Black
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Nikon D3 System Compatibility
Which wide angle lens can be compatible with Nikon-D40 and best result.? - Quora
Nikon D40 6.1MP Digital SLR Camera (Lens w/ 18-55mm) Black
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Compatible Lenses for Nikon D40, D60, D3200, D3300, D5300, D5500
Nikon D40X Review - Optics
Nikon Camera and Lens Compatibility Chart
Nikon D60 to replace D40x, still has a booty lens mount | TechCrunch
Buy Boosty ® MH-23 Quick Charger for Camera Battery Compatible with Nikon D40 D40X D60 D3000 D5000 SLR Camera (MH-23 (EN-EL9) Online at Low Prices in India - Amazon.in
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List of Nikon F-mount lenses with integrated autofocus motor - Wikipedia