|Nikon D40 with manual focus, AI 50 mm. f/1.4 lens|
|Do not mount unmodified NAI, also called Pre-AI, non-AI, F-type (A, C, F, H & HC, K, N & NC, O, PD, Q & QD, S & SC, T, UD, Auto, etc.) lenses on your Nikon DSLR or you will be sorry.
The fact that the NAI compatible Nikon Df lists certain NAI Nikkor Auto lenses as incompatible ought to be warning enough!
|New (25/10/2014). The mother of all Nikon DSLR MF, AF-D, AF-I, AF-S, GPS compatibility charts
New (24/10/2014). A more thorough job than this: The Nikon F-mount and manual focus NAI, AI, AI-S, AI-P, Series E and auto-focus AF-D, AF-I, AF-S, D- and G-Type lenses. A compatibility inventory
Virtually all Nikkor lenses produced since the introduction of AI in 1977 can be mounted and used on virtually all Nikon cameras produced since 1977, because the Nikon F-Mount has remained fundamentally unchanged since 1959.
In other words: Nikon DSLRs are almost 100% backwards compatible with Nikkor lenses back to 1977...
That this is no small feat, is particularly well demonstrated by the fact that Canon have had to change their mount 5 times in the same period (R, FL, FD, new FD and EOS), while these mounts are not always backwards compatible.
Mounting a lens on a camera is one thing, however, can you actually shoot with it? Yes you can!
The following manual focus (non-CPU) lenses and accessories are compatible with the D40, and if they are compatible with an entry-level camera, they ought to be compatible with most everything else.
• AI, AI-S, E-series
• AI-P (post-chipped AI)
• Medical 120 mm. f/4
• Reflex Nikkor
• Nikkor PC (perspective control)
• AI tele-converters
• PB-6 bellows
• PK-11A, 12, 13 and PN-11 extension rings.