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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 542168" data-attributes="member: 10742">My back button is setup to be "single" focus when pressed once. When you hold the button down, it stays in Continuous focus mode until you release the button... While in Continuous mode, as you turn the lens's focus ring on a manual lens like the AI... you'll notice the green focus lights in the lower left of the viewfinder cycle... I use spot focus with a single point... when the green dot comes on, the lens/camera has achieved focus for that focus point... Try it...Yes... I tried several aperture settings using the above processes... and all exposures are fine within the limits of the max ISO... I'm using Matrix metering incidentally...</blockquote>