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<blockquote data-quote="Bob Blaylock" data-source="post: 410723" data-attributes="member: 16749">If I am not mistaken, then Nikon's statement about non-AI lenses being compatible with all DSLRs other than the DF model notwithstanding, I think that the D5100, like my D3200, simply cannot tell the difference between an AI and a non-AI lens, and that it would make absolutely no difference to it whether this is a non-AI lens, an AI lens, or a formerly non-AI lens converted to AI.&nbsp; As far as what to expect with such an old lens…&nbsp; Obviously, no autofocusing.&nbsp; No lens of that period would have even thought of supporting autofocus, much less had a built-in focusing motor such as the D3??? and D5??? lines require.&nbsp; Seriously consider installing a third-party focus screen; if the screen in the D5100 is anything like the one that came stock in my D3200, it is quite worthless for manual focusing.&nbsp; Go to eBay and do a search for BRESSON FOCUS SCREEN NIKON.&nbsp; And your camera will only work in M mode, with no metering whatsoever.&nbsp; There's probably a section in your owner's manual that covers lens compatibility, discusses the limitations of such limited-compatibility lenses, and claims that non-AI lenses cannot be used at all.&nbsp; It's page 169 in the D3200 manual.&nbsp; It's wrong about non-AI lenses, though.&nbsp; Non-AI lenses will work just fine, albeit with exactly the same limitations as any non-CPU lenses.&nbsp; Oh, and yes, a 35mm lens with a DX sensor will give approximately the same field of view than a 50mm would give on an FX sensor or on stone-aged full-frame 35mm film.</blockquote>

[QUOTE="Bob Blaylock, post: 410723, member: 16749"] If I am not mistaken, then Nikon's statement about non-AI lenses being compatible with all DSLRs other than the DF model notwithstanding, I think that the D5100, like my D3200, simply cannot tell the difference between an AI and a non-AI lens, and that it would make absolutely no difference to it whether this is a non-AI lens, an AI lens, or a formerly non-AI lens converted to AI. As far as what to expect with such an old lens… Obviously, no autofocusing. No lens of that period would have even thought of supporting autofocus, much less had a built-in focusing motor such as the D3??? and D5??? lines require. Seriously consider installing a third-party focus screen; if the screen in the D5100 is anything like the one that came stock in my D3200, it is quite worthless for manual focusing. Go to eBay and do a search for BRESSON FOCUS SCREEN NIKON. And your camera will only work in M mode, with no metering whatsoever. There's probably a section in your owner's manual that covers lens compatibility, discusses the limitations of such limited-compatibility lenses, and claims that non-AI lenses cannot be used at all. It's page 169 in the D3200 manual. It's wrong about non-AI lenses, though. Non-AI lenses will work just fine, albeit with exactly the same limitations as any non-CPU lenses. Oh, and yes, a 35mm lens with a DX sensor will give approximately the same field of view than a 50mm would give on an FX sensor or on stone-aged full-frame 35mm film. [/QUOTE]

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