Are you talking about a D70 or N70? The D70 is a great digital slr and the N70 was a 35mm film slr. Any Nikon S series lens from the D70 will autofocus with the D40. But others will need to be manually focused. Here's a list of current lenses that au...
Why don't you like Nikkor? It is some of the best glass available. Some good advice from a pro
Here's a partial cut and paste from another question I answered before. All the lenses you currently have will work and autofocus with the D80, D200, D300, D2 and D3 series. Any Nikon S series lens from the D50 will autofocus with the D40. But others...