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<blockquote data-quote="Bob Blaylock" data-source="post: 567724" data-attributes="member: 16749">Originally, this linkage wasn't even for setting the aperture.&nbsp; It was just so that the camera could open the aperture all the way, when viewing, and then release it to close down to the aperture set on the lens' aperture ring when taking the picture.&nbsp; On any non-G lens, when the lens is not mounted on a body, the aperture will be closed to whatever is set on the ring.&nbsp; Pushing this linkage upward will open the aperture, and releasing it will allow it to close down again.&nbsp; The earliest Nikon SLRs only did that much; when viewing, the linkage was pushed all the way up, opening the lens to its widest aperture; and when taking a picture, it was released, allowing the lens to close down to the aperture that was set on the ring.&nbsp; It was with the AI-S development that this linkage was calibrated and made linear, so that it could be used by the camera body to control the aperture in an accurate manner.&nbsp; And of course, with the G lenses, which have no aperture ring, this linkage becomes the only way to control the aperture.</blockquote>

[QUOTE="Bob Blaylock, post: 567724, member: 16749"] Originally, this linkage wasn't even for setting the aperture. It was just so that the camera could open the aperture all the way, when viewing, and then release it to close down to the aperture set on the lens' aperture ring when taking the picture. On any non-G lens, when the lens is not mounted on a body, the aperture will be closed to whatever is set on the ring. Pushing this linkage upward will open the aperture, and releasing it will allow it to close down again. The earliest Nikon SLRs only did that much; when viewing, the linkage was pushed all the way up, opening the lens to its widest aperture; and when taking a picture, it was released, allowing the lens to close down to the aperture that was set on the ring. It was with the AI-S development that this linkage was calibrated and made linear, so that it could be used by the camera body to control the aperture in an accurate manner. And of course, with the G lenses, which have no aperture ring, this linkage becomes the only way to control the aperture. [/QUOTE]

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