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Message: <blockquote data-quote="stmv" data-source="post: 84363" data-attributes="member: 10038">essentially, the fstop that you have set on the camera is the fstop that the picture will be taken. During you composition, it keeps it open, and when you take the shot, stops down to the set value for the exposure. A variable fstop just means that they did not have enough light to maintain the more light fstop thru the whole lens zoom range. The tradeoff is lens area and cost. So, the pro level lens often have the most open setting available thru the whole zoom lens, while the less expensivedesigns have variable fstops. Lot more explanation out there on the net.</blockquote>