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<blockquote data-quote="Texas" data-source="post: 668992" data-attributes="member: 42267">Back to bandit's initial concerns, setting the F stops to the same value on two different lenses, everything else being equal, will give the same exposure on both.&nbsp; That is, unless one lens of the two is a macro/micro and you are close focusing with it. &nbsp;In that case, relying on matching the F stops on both lenses to get the same exposure will be folly since the F stop shown on/by the macro lens will no longer match that of the other lens as to light transmitted to the sensor/film.It may not be cheating to print a single F stop spec on a macro lens.&nbsp; But it is nice that zoom lenses of a certain design do note a change of F stop vs. focal length.&nbsp; I'd like to see macro lenses do something similar based on focus distance but I fear the extreme F stop range would scare off buyers.&nbsp; That bellows effect is a big one.</blockquote>

[QUOTE="Texas, post: 668992, member: 42267"] Back to bandit's initial concerns, setting the F stops to the same value on two different lenses, everything else being equal, will give the same exposure on both. That is, unless one lens of the two is a macro/micro and you are close focusing with it. In that case, relying on matching the F stops on both lenses to get the same exposure will be folly since the F stop shown on/by the macro lens will no longer match that of the other lens as to light transmitted to the sensor/film. It may not be cheating to print a single F stop spec on a macro lens. But it is nice that zoom lenses of a certain design do note a change of F stop vs. focal length. I'd like to see macro lenses do something similar based on focus distance but I fear the extreme F stop range would scare off buyers. That bellows effect is a big one. [/QUOTE]

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