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<blockquote data-quote="Bob Blaylock" data-source="post: 607483" data-attributes="member: 16749">Non-AI lenses were made long before there was any such thing as autofocus.&nbsp; The damage issue has to do with the AI coupling itself.&nbsp; In 1978, Nikon changed the way in which the lens communicated to the camera what aperture it was set to.&nbsp; The old (non-AI) way used that slotted tab that you see on old lenses, which engaged a pin on the camera.&nbsp; The new AI way involves a notch in the aperture ring, that engages a tab on the camera.&nbsp; Early AI cameras had that tab made so that you could fold it up out of the way to mount a non-AI lens; otherwise, mounting a non-AI lens, which doesn't have a notch to accommodate that tab, can damage the tab.&nbsp; The D3x00 and D5x00 cameras don't have an AI tab.&nbsp; They will only communicate with a lens electronically, and thus, cannot meter with lenses that don't contain the necessary electronics.&nbsp; Higher models have an AI tab, and are thus able to meter with older non-electronic AI lenses, but at the expense of being vulnerable to damage if you try to mount a non-AI lens on them.</blockquote>

[QUOTE="Bob Blaylock, post: 607483, member: 16749"] Non-AI lenses were made long before there was any such thing as autofocus. The damage issue has to do with the AI coupling itself. In 1978, Nikon changed the way in which the lens communicated to the camera what aperture it was set to. The old (non-AI) way used that slotted tab that you see on old lenses, which engaged a pin on the camera. The new AI way involves a notch in the aperture ring, that engages a tab on the camera. Early AI cameras had that tab made so that you could fold it up out of the way to mount a non-AI lens; otherwise, mounting a non-AI lens, which doesn't have a notch to accommodate that tab, can damage the tab. The D3x00 and D5x00 cameras don't have an AI tab. They will only communicate with a lens electronically, and thus, cannot meter with lenses that don't contain the necessary electronics. Higher models have an AI tab, and are thus able to meter with older non-electronic AI lenses, but at the expense of being vulnerable to damage if you try to mount a non-AI lens on them. [/QUOTE]

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