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<blockquote data-quote="aroy" data-source="post: 469064" data-attributes="member: 16090">OK. Here is how most of the Nikon lenses with mechanical aperture work. The aperture ring moves a &quot;lever&quot; (aperture lever) inside the lens.. There is a &quot;feeler&quot; lever on the lens back. In normal position it keeps the aperture fully open. Moving it will change the aperture opening. It will move till it reaches the aperture &quot;lever&quot; inside the lens. That closes the aperture to the value set by the aperture ring on the lens.. There is a corresponding feeler on the camera body, which moves the feeler on the lens. In older manual cameras, the body feeler would just move the lens feeler, and it stops when it reaches the aperture &quot;lever&quot; in the lens. So the aperture is stopped down to the value set by the aperture ring.. In modern cameras, the body feeler movement is controlled by the body, and it moves to what ever aperture is set by the body, provided the lens has a CPU, other wise (as in case of AIS lenses with no CPU) you set the aperture on the lens and the body just closes the aperture to what ever is set on the lens.Now if you mount AIS lens on a modern body, the aperture is at its maximum (fully open). It is only when you shoot that the aperture stops down to the value set by the aperture ring.</blockquote>

[QUOTE="aroy, post: 469064, member: 16090"] OK. Here is how most of the Nikon lenses with mechanical aperture work . The aperture ring moves a "lever" (aperture lever) inside the lens. . There is a "feeler" lever on the lens back. In normal position it keeps the aperture fully open. Moving it will change the aperture opening. It will move till it reaches the aperture "lever" inside the lens. That closes the aperture to the value set by the aperture ring on the lens. . There is a corresponding feeler on the camera body, which moves the feeler on the lens . In older manual cameras, the body feeler would just move the lens feeler, and it stops when it reaches the aperture "lever" in the lens. So the aperture is stopped down to the value set by the aperture ring. . In modern cameras, the body feeler movement is controlled by the body, and it moves to what ever aperture is set by the body, provided the lens has a CPU, other wise (as in case of AIS lenses with no CPU) you set the aperture on the lens and the body just closes the aperture to what ever is set on the lens. Now if you mount AIS lens on a modern body, the aperture is at its maximum (fully open). It is only when you shoot that the aperture stops down to the value set by the aperture ring. [/QUOTE]

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