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Message: <blockquote data-quote="mikew_RIP" data-source="post: 436474" data-attributes="member: 14174">I only ever use the center point as i use my lens at 600mm a lot,wasn't sure if the surrounding points where F5.6 with a programed shut off or where capable of F8 in perfect contrast/lighting situations,in the early days a AF system would work until it didn't get enough light,although a manufacture would claim maybe F4 it would often hunt around at smaller stops and actually focus in the right conditions.If its a programmed shut off there is no point in me considering using multi point,think i need to wait for a bright day and select an off center point and try it at F6.3.</blockquote>