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Message: <blockquote data-quote="STM" data-source="post: 128543" data-attributes="member: 12827"><p>There are two types of zooms; one where maximum aperture remains constant regardless of focal length and those whose maximum aperture varies with focal length. Ones were the maximum aperture remains constant are most complex and therefore more expensive. With the old AI and AIS Nikkors, you simply set the aperture (of if you had an AIS, you could it to the smallest aperture in the shutter speed automation mode), and adjusted focus and focal length manually.</p></blockquote><p></p>