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<blockquote data-quote="WayneF" data-source="post: 418399" data-attributes="member: 12496">It is NOT a AI lens.&nbsp; It is pre-AI.&nbsp;&nbsp; I had mine modified by Nikon to AI about 20&nbsp; years ago.&nbsp; Nikon advises to NOT use non-AI lenses on digital cameras.&nbsp;&nbsp; It is not made for digital, and it is said that it can cause damage to the&nbsp; electrical contacts in the digital body opening. It will be fine on a film body.It will focus up very close, as is, without the extension tube.&nbsp; Up to within 4 or 5 inches as is (from front of lens).&nbsp; Up to 2:1 size, which means if the subject is one inch dimension, the subject image on the sensor will be 1/2 inch size.&nbsp; That provides for most macro work, all but the most extreme closeup.If you add the extension (about 27mm length), it will focus to 1:1, up to within a couple of inches (from front of lens). Any subject one inch dimension will project an image 1 inch size, which is 1:1&nbsp; ( but the digital DX sensor is only about 0.6 inches tall and one inch wide).</blockquote>

[QUOTE="WayneF, post: 418399, member: 12496"] It is NOT a AI lens. It is pre-AI. I had mine modified by Nikon to AI about 20 years ago. Nikon advises to NOT use non-AI lenses on digital cameras. It is not made for digital, and it is said that it can cause damage to the electrical contacts in the digital body opening. It will be fine on a film body. It will focus up very close, as is, without the extension tube. Up to within 4 or 5 inches as is (from front of lens). Up to 2:1 size, which means if the subject is one inch dimension, the subject image on the sensor will be 1/2 inch size. That provides for most macro work, all but the most extreme closeup. If you add the extension (about 27mm length), it will focus to 1:1, up to within a couple of inches (from front of lens). Any subject one inch dimension will project an image 1 inch size, which is 1:1 ( but the digital DX sensor is only about 0.6 inches tall and one inch wide). [/QUOTE]

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